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Thread: How to create Starry Night Sky Effect With Photoshop CS6

  1. #1
    Senior Member ghaza's Avatar
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    How to create Starry Night Sky Effect With Photoshop CS6

    Written by Steve Patterson. In this photo effects tutorial, weíll learn how to easily fill an empty night sky with stars using Photoshop CS6. This tutorial is also fully compatible with Photoshop CC (Creative Cloud). If youíre using Photoshop CS5 or earlier, youíll want to check out the original version of our Starry Night Sky tutorial.

    Capturing a star-filled night sky with our cameras can be tricky. Often there are other, brighter light sources nearby (like city lights), and of course thereís the added problem of our planet refusing to play nice and stop spinning for us during the exposure. What we often end up with is either an interesting (but unwanted) star trail effect or a night sky filled with nothing but darkness. Fortunately, as weíll see in this tutorial, Photoshop makes it easy to add the stars into our photos later, with the additional benefit of being able to control just how "starry" the sky becomes. The result may not fool any astronomers or astrophysicists in the family, but considering that this same technique is often used to create star-filled backgrounds for movies, the effect is more than realistic enough to fool pretty much everyone else.

    Download our tutorials as print-ready PDFs! Learning Photoshop has never been easier!
    Hereís the photo Iíll be starting with (city at night photo from Shutterstock):

    How to create Starry Night Sky Effect With Photoshop CS6-01city-night.jpg

    The original photo.


    And hereís what the final "starry night sky" effect will look like:


    How to create Starry Night Sky Effect With Photoshop CS6-02photoshop-star-filled-sky-effect.jpg

    The final effect.

    Letís get started!

    Step 1: Add A New Blank Layer

    With our photo newly opened in Photoshop, if we look in the Layers panel, we see the image sitting on the Background layer which is currently the only layer in the document:


    How to create Starry Night Sky Effect With Photoshop CS6-03photoshop-layers-panel.gif

    The Layers panel showing the original image.
    Letís add a new blank layer for our stars. Click on the New Layer icon at the bottom of the Layers panel (second icon from the right):


    How to create Starry Night Sky Effect With Photoshop CS6-04new-layer-icon.gif

    Clicking the New Layer icon.
    Photoshop adds a new blank layer named Layer 1 above the Background layer
    How to create Starry Night Sky Effect With Photoshop CS6-05new-layer-1.gif

    The new blank layer is added.
    Step 2: Fill The New Layer With Black

    We need to fill our new layer with black. For that, weíll use Photoshopís Fill command. Go up to the Edit menu in the Menu Bar along the top of the screen and choose Fill:


    How to create Starry Night Sky Effect With Photoshop CS6-06select-fill-command.gif

    Going to Edit > Fill.


    This opens the Fill dialog box. Change the Use option at the top of the dialog box to Black. In the Blending section in the bottom half of the dialog box, make sure Mode is set to Normal and Opacity is set to 100% (which they should be set to by default):


    How to create Starry Night Sky Effect With Photoshop CS6-07photoshop-fill-command.gif

    Changing the Use option to Black.
    Click OK when youíre done to close out of the Fill dialog box, at which point Photoshop fills the new layer with black, temporarily blocking our photo from view:


    How to create Starry Night Sky Effect With Photoshop CS6-08filled-black.gif

    Filling the top layer with black hides the photo on the layer below it.
    Step 3: Convert The Layer Into A Smart Object

    In a moment, weíre going to apply a couple of Photoshopís filters to this black-filled layer. But before we do, letís first convert the layer into a Smart Object. That way, our filters will be applied as Smart Filters, allowing us to go back and edit their settings later if we need to. With Layer 1 selected (it should be highlighted in blue), click on the small menu icon in the top right corner of the Layers panel:


    How to create Starry Night Sky Effect With Photoshop CS6-09layers-panel-menu-icon.gif

    Clicking the Layers panel menu icon.
    Then choose Convert to Smart Object from the menu that appears:


    How to create Starry Night Sky Effect With Photoshop CS6-10convert-smart-object.gif

    Selecting Convert to Smart Object from the Layers panel menu.


    Nothing will seem to have happened to the image, but a small Smart Object icon appears in the lower right corner of the layerís preview thumbnail in the Layers panel. This lets us know the layer is now a Smart Object:


    How to create Starry Night Sky Effect With Photoshop CS6-11smart-object-icon.gif

    Smart Objects are indicated by a small icon in their preview thumbnail.
    Step 4: Apply The Add Noise Filter

    Weíre ready to add our filters, and weíll start with the Add Noise filter. Go up to the Filter menu at the top of the screen, choose Noise, then choose Add Noise:


    How to create Starry Night Sky Effect With Photoshop CS6-12select-add-noise-filter.gif

    Going to Filter > Noise > Add Noise.
    This opens the Add Noise dialog box. The Add Noise filter basically adds a bunch of little white, single-pixel dots to the black-filled layer, and we control how many dots are added using the Amount value. Enter a value of around 25%. At the bottom of the dialog box, set the Distribution option to Gaussian and select the Monochromatic option, which will prevent any colors other than black and white from appearing in the noise:


    How to create Starry Night Sky Effect With Photoshop CS6-13add-noise-filter.gif

    The Add Noise dialog box.
    Click OK to close out of the Add Noise dialog box. Photoshop fills the layer with noise (random dots):


    How to create Starry Night Sky Effect With Photoshop CS6-14image-add-noise.jpg

    The image after applying the Add Noise filter.
    If we look back in the Layers panel, we see the Add Noise filter listed as a Smart Filter below Layer 1:


    How to create Starry Night Sky Effect With Photoshop CS6-15add-noise-smart-filter.gif

    The Layers panel showing the Add Noise Smart Filter.
    Step 5: Apply The Gaussian Blur Filter

    Now that weíve added some noise, we need to add a bit of blurring to it, which will make those single-pixel dots a bit wider and clump some of them together. Weíll do that using Photoshopís Gaussian Blur filter. Go back up to the Filter menu, choose Blur, then choose Gaussian Blur:


    How to create Starry Night Sky Effect With Photoshop CS6-16select-gaussian-blur-filter.gif

    Going to Filter > Blur > Gaussian Blur.
    This opens the Gaussian Blur dialog box. We control the amount of blurring using the Radius value, and you can either enter a value directly into the Radius box or drag the slider along the bottom to increase or decrease the value. The value youíll want to enter here will depend on the size of your image. Generally, a Radius value of 2 to 6 pixels works best, with 2 pixels being ideal for small images and 6 pixels for very large images.
    The nice thing is, since weíre adding the Gaussian Blur filter as a Smart Filter, we can easily go back later and try a different value. Iím going to enter a Radius value of 3 pixels:


    How to create Starry Night Sky Effect With Photoshop CS6-17gaussian-blur-radius.gif

    Setting the Radius value to 3 pixels.
    Click OK when youíre done to close out of the dialog box and apply the blurring effect to the noise. If we look again in the Layers panel, we see both the Add Noise and Gaussian Blur filters listed as Smart Filters below Layer 1:


    How to create Starry Night Sky Effect With Photoshop CS6-18gaussian-blur-smart-filter.gif

    Both filters are now listed as Smart Filters.
    If you decide later on that you want to try a different Radius value for the Gaussian Blur filter, all youíll need to do is double-click directly on the words Gaussian Blur:


    How to create Starry Night Sky Effect With Photoshop CS6-19double-click-gaussian-blur.gif

    Double-clicking on the Gaussian Blur Smart Filter.
    This will re-open the filterís dialog box where you can enter in a different Radius value, again anywhere from 2 to 6 pixels depending on the size of your image. Simply click OK when youíre done to close back out of the dialog box. You can do this as often as you like because Smart Filters in Photoshop are non-destructive, meaning no permanent changes are ever made to the image. Using Smart Filters with our effects make it easy to fine-tune them and get them looking just right.

  2. #2
    Senior Member ghaza's Avatar
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    Starry Night Sky Effect With Photoshop CS6 part 2

    Step 6: Add A Levels Adjustment Layer

    Next, we need to brighten the lightest areas of our noise layer and darken the darkest areas. This will turn the faint, blurry noise into our stars. Press and hold the Alt (Win) / Option (Mac) key on your keyboard and click on the New Adjustment Layer icon at the bottom of the Layers panel:

    How to create Starry Night Sky Effect With Photoshop CS6-20new-adjustment-layer-icon.gif

    Clicking the New Adjustment Layer icon while pressing and holding Alt (Win) / Option (Mac).
    Choose a Levels adjustment layer from the menu that appears:
    How to create Starry Night Sky Effect With Photoshop CS6-21choose-levels-adjustment.gif

    Choosing a Levels adjustment layer.
    Photoshop will pop open the New Layer dialog box. Select the Use Previous Layer to Create Clipping Mask option by clicking inside its checkbox. This will clip our adjustment layer to the noise layer below it, meaning that anything we do with the Levels adjustment layer will affect only the noise layer. The original image on the Background layer will not be affected. Click OK when youíre done to close out of the dialog box:
    How to create Starry Night Sky Effect With Photoshop CS6-22new-layer-dialog-box.gif

    Checking the Use Previous Layer to Create Clipping Mask option.
    Photoshop adds the new Levels adjustment layer, named Levels 1, above the noise layer. It appears indented to the right with a small arrow pointing down at the layer below it. This tells us the adjustment layer is clipped to the noise layer:
    How to create Starry Night Sky Effect With Photoshop CS6-23levels-adjustment-layer.gif

    The Levels adjustment layer (Levels 1) is added above Layer 1.
    Learn how clipping masks work in Photoshop

    Step 7: Adjust The White And Black Point Sliders

    The controls and options for the Levels adjustment layer appear in the Properties panel. In the center of the panel is the Histogram, a graph showing us the current tonal range of the image (or in this case, the tonal range of the noise layer). Directly below the histogram are three little sliders. The one on the far left, filled with black, is the black point slider. The one on the far right, filled with white, is the white point slider. Thereís also a gray slider in the middle, but for this effect, we wonít need to use it:


    How to create Starry Night Sky Effect With Photoshop CS6-24levels-properties-panel.gif

    The black point (left) and white point (right) sliders.


    Click on the white point slider on the right and begin dragging it towards the left. As you drag, youíll see the lighter areas of the noise becoming brighter. Drag the slider all the way over to where the right side of the histogram begins. This will brighten the lightest areas of noise to pure white:
    How to create Starry Night Sky Effect With Photoshop CS6-25levels-white-point.gif
    Dragging the white point slider to the right side of the histogram.


    Hereís what my image looks like after dragging the white point slider to the left

    How to create Starry Night Sky Effect With Photoshop CS6-26image-white-point.jpg

    The lightest areas of noise are now much brighter.


    Next, click on the black point slider on the left and begin dragging it towards the right. As you drag, youíll see the darkest areas of noise becoming pure black. As you drag the slider further, more and more of the noise will disappear into the darkness. Youíll need to drag the black point slider very close to the white point slider to achieve the best results, and youíll probably want to play around with both sliders a bit to fine-tune the effect:
    How to create Starry Night Sky Effect With Photoshop CS6-27drag-levels-black-point.gif

    Dragging the black point slider to the right.


    Hereís my stars effect after dragging the black point slider. One important note is that if youíre creating the effect for print, youíll want to adjust the white and black point sliders so that it looks like you actually have more stars than you need, and thatís because youíll lose some of the effect during the print process. If youíre creating the effect strictly for the screen, you wonít need to worry it:
    How to create Starry Night Sky Effect With Photoshop CS6-28image-black-point.jpg

    The effect after adjusting the black point slider.


    I mentioned earlier that you can go back at any point and re-adjust the amount of blurring being applied to the noise layer by double-clicking on the Gaussian Blur Smart Filter in the Layers panel (see Step 5). You can also go back and re-adjust these white point and black point sliders. Simply click on the Levels adjustment layer in the Layers panel to make it the active layer (if it isnít active already), then drag the sliders in the Properties panel. Just like Smart Filters, adjustment layers in Photoshop are non-destructive and fully editable. No permanent changes are made to the image.
    Download our tutorials as print-ready PDFs! Learning Photoshop has never been easier!

    Step 8: Add A Hue/Saturation Adjustment Layer

    Letís add a bit of color to the stars, and we can do that using a Hue/Saturation adjustment layer. Once again press and hold your Alt (Win) / Option (Mac) key on your keyboard, then click on the New Adjustment Layer icon at the bottom of the Layers panel:
    How to create Starry Night Sky Effect With Photoshop CS6-29new-adjust-layer-icon-2.gif

    Clicking again on the New Adjustment Layer icon while holding Alt (Win) / Option (Mac).


    Select a Hue/Saturation adjustment layer from the list that appears:
    How to create Starry Night Sky Effect With Photoshop CS6-30select-hue-saturation.gif

    Choosing Hue/Saturation from the menu.
    Photoshop will again pop open the New Layer dialog box. Just as we did before, select the Use Previous Layer to Create Clipping Mask option by clicking inside its checkbox:


    How to create Starry Night Sky Effect With Photoshop CS6-31use-previous-layer-2.gif

    Selecting the Use Previous Layer to Create Clipping Mask option.


    Click OK when youíre done to close out of the dialog box. Photoshop adds a new Hue/Saturation adjustment layer named Hue/Saturation 1 above the Levels layer (Iíve expanded the width of the Layers panel in the screenshot just to make the name visible). This new adjustment layer is also clipped to the noise layer, allowing us to colorize only the noise, not the original image:
    How to create Starry Night Sky Effect With Photoshop CS6-32hue-saturation-layer.gif

    The Layers panel showing the new Hue/Saturation adjustment layer.
    With the Hue/Saturation adjustment layer active in the Layers panel, the Properties panel changes to the Hue/Saturation controls and options. First, select the Colorize option near the bottom of the dialog box by clicking inside its checkbox. Then, drag the Hue slider to select whichever color you like for your stars. I think blue looks nice, so Iíll drag my Hue slider over to the right to a value of around 212. If you think the color looks too intense, drag the Saturation slider towards the left to reduce it. Iíll lower my Saturation value from its default value of 25 down to 15:
    How to create Starry Night Sky Effect With Photoshop CS6-33hue-saturation-options.gif

    Checking Colorize, then dragging the Hue and Saturation sliders.


    Hereís my image after colorizing the stars. The colorizing effect is quite subtle so it may be easier to see the result with your own image in Photoshop than it is in this screenshot:
    How to create Starry Night Sky Effect With Photoshop CS6-34stars-colorized.jpg

    The effect after colorizing the stars.
    Step 9: Group All Three Layers Above The Background Layer

    Of course, we do have one big problem at the moment. Our stars are completely blocking the original photo from view. Letís fix that, and weíll start by taking all three layers that are combining to create the stars effect (in other words, all the layers sitting above the Background layer) and grouping them together into a layer group.

    With the top Hue/Saturation layer selected in the Layers panel, hold down the Shift key on your keyboard and click on the noise layer (Layer 1). This will select all three layers at once (theyíll all appear highlighted in blue)

    How to create Starry Night Sky Effect With Photoshop CS6-35select-three-layers.gif

    All three layers above the Background layer are selected.
    With the layers selected, click on the Layers panel menu icon in the top right corner:
    How to create Starry Night Sky Effect With Photoshop CS6-36menu-icon.gif

    Clicking the menu icon.


    Choose New Group from Layers from the menu:
    How to create Starry Night Sky Effect With Photoshop CS6-37new-group-layers.gif

    Selecting New Group from Layers from the Layers panel menu.
    Photoshop opens the New Group from Layers dialog box. Name the group ďStarsĒ, then click OK to close out of it:
    How to create Starry Night Sky Effect With Photoshop CS6-38naming-layer-group.gif

    The New Group from Layers dialog box.
    The new Stars group appears in the Layers panel with our three layers inside it. If you click the triangle icon to the left of the folder icon, you can twirl the group open and see the layers nested within it. Click the triangle icon again to twirl it closed:
    Attachment 1377How to create Starry Night Sky Effect With Photoshop CS6-39new-stars-layer-group.gif
    Layer groups are a great way to keep the Layers panel organized.
    Attachment 1377
    Attachment 1377
    Attachment 1377
    Last edited by ghaza; 11-23-2013 at 10:36 AM.

  3. #3
    Senior Member ghaza's Avatar
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    How to create Starry Night Sky Effect With Photoshop CS6 part 3

    Step 10: Turn The Layer Group Off

    Letís hide the Stars group temporarily so we can see our original image. To do that, click on the layer groupís visibility icon (the little eyeball):
    How to create Starry Night Sky Effect With Photoshop CS6-40group-visibility-icon.gif

    Clicking the layer groupís visibility icon.


    The original image reappears in the document:
    How to create Starry Night Sky Effect With Photoshop CS6-41city-night.jpg

    The original image is once again visible.
    Step 11: Select The Area Where The Stars Should Not Appear

    Now that we can see our image again, we need to select the area where the stars should not be visible. In my case, that would be the city in the bottom of the image, as well as the (barely visible) mountain range off in the distance. Photoshop has plenty of selection tools to choose from, and the one youíll want to use will depend on the subject you need to select. Iím going to keep things simple here and go with the standard Lasso Tool which Iíll grab from the Tools panel:
    How to create Starry Night Sky Effect With Photoshop CS6-42photoshop-lasso-tool.gif

    Selecting the Lasso Tool.


    With the Lasso Tool in hand, Iíll drag along the top of the city and mountain range. With this image, thereís no need to be surgically precise with my selection (which is why I chose the Lasso Tool) but Iíll still keep my selection outline as close to the edges of my subject(s) as possible. To select the sides and bottom of the photo, I can simply drag outside the image into the gray pasteboard area. Photoshop will automatically snap the selection outline to the edges of the image:

    How to create Starry Night Sky Effect With Photoshop CS6-43selecting-city.jpg

    The area along the bottom of the image is now selected.
    I think I also want to select the area around the moon in the top right corner of the photo. For that, Iíll use Photoshopís Elliptical Marquee Tool. To select it, Iíll click and hold on the Rectangular Marquee Tool in the Tools panel, then Iíll grab the Elliptical Marquee Tool from the fly-out menu that appears:
    How to create Starry Night Sky Effect With Photoshop CS6-44elliptical-marquee-tool.gif

    Selecting the Elliptical Marquee Tool.
    The default behavior for most of Photoshopís selection tools, including the Elliptical Marquee Tool, is to create a brand new selection, but what I want to do here is add a new area to the selection Iíve already created, so Iíll click on the Add to Selection icon up in the Options Bar:
    How to create Starry Night Sky Effect With Photoshop CS6-45add-selection.gif

    Changing the behavior of the Elliptical Marquee Tool from New Selection to Add to Selection.
    Then, Iíll position my mouse cursor in the center of the moon. The small plus icon ( + ) in the lower right of the cursor tells me Iím in Add to Selection mode:


    How to create Starry Night Sky Effect With Photoshop CS6-46center-moon.jpg

    Centering the Elliptical Marquee Tool cursor inside the moon.


    Iíll click and, with my mouse button held down, Iíll begin dragging outward from the center. As soon as I start dragging, Iíll press and hold Shift+Alt (Win) / Shift+Option (Mac) on my keyboard, then continue dragging. Holding the Shift key will force my elliptical selection into a perfect circle, while the Alt (Win) / Option (Mac) key tells Photoshop to drag the selection outward from the spot I clicked on:
    How to create Starry Night Sky Effect With Photoshop CS6-47drag-center.jpg

    Centering the Elliptical Marquee Tool cursor inside the moon.


    Iíll release my mouse button when Iím done, and now we can see that I have both the city along the bottom of the photo and the moon in the upper right corner selected. These are the areas where the stars will not appear:
    How to create Starry Night Sky Effect With Photoshop CS6-48area-selected.jpg

    The area around the moon has been added to the initial selection.


    Learn how to add, subtract and intersect your selections in Photoshop

    Step 12: Turn The Layer Group Back On

    Click once again on the layer groupís visibility icon (the empty square where the eyeball used to be) to make the group visible again in the document:
    How to create Starry Night Sky Effect With Photoshop CS6-49turn-layer-group-.gif

    Clicking the Stars layer groupís visibility icon.
    The stars will again block the original image from view, but the selection outline(s) will remain visible:


    How to create Starry Night Sky Effect With Photoshop CS6-50stars-selection-outline.jpg

    The selection outlines appear in front of the stars.
    Step 13: Add A Layer Mask

    Press and hold the Alt (Win) / Option (Mac) key on your keyboard and click the Add Layer Mask icon at the bottom of the Layers panel:
    How to create Starry Night Sky Effect With Photoshop CS6-51add-layer-mask-icon.gif

    Clicking the Add Layer Mask icon (while holding Alt (Win) / Option (Mac)).
    Photoshop adds a layer mask to the Stars group and uses our selection to determine which areas of the group should remain visible and which should be hidden. Normally, the area inside the selection would remain visible, but by holding down the Alt (Win) / Option (Mac) key, we told Photoshop to do the opposite and keep everything outside the selection visible while hiding the areas inside it:
    How to create Starry Night Sky Effect With Photoshop CS6-52image-layer-mask-added.jpg

    The image after adding the layer mask.


    If we look in the Layers panel, we see that a layer mask thumbnail has been added to the Stars group, with black representing the areas that are hidden from view and white being the visible areas:


    How to create Starry Night Sky Effect With Photoshop CS6-53layer-mask-thumbnail.gif

    The Layers panel showing the mask thumbnail.
    Understanding layer masks in Photoshop

    Step 14: Change The Blend Mode Of The Layer Group To Screen

    The only problem remaining is that Iím seeing harsh, ugly edges separating the visible and hidden areas of the stars. To blend the stars in with the original photo and create seamless transitions, change the blend mode of the Stars layer group from Pass Through to Screen. The blend mode option is found in the upper left corner of the Layers panel:

    How to create Starry Night Sky Effect With Photoshop CS6-54layer-blend-mode.gif

    Changing the blend mode of the Stars group to Screen.


    Here, after changing the blend mode to Screen, is my final starry night sky effect:


    How to create Starry Night Sky Effect With Photoshop CS6-55photoshop-star-filled-sky-effect.jpg

    The final result.
    And there we have it! Thatís how to fill your night skies with stars using Photoshop CS6 and Photoshop CC (Creative Cloud)!

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