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When you use Photoshop to bring two images together, you always have to deal with the issue of relative size. Here's how to ensure that the two images you want to combine are sized correctly.
Magnify the two images to exactly the same zoom factor.
If either of the two images appears disproportionately large, scale it down by using Image, Image Size.
Keep Ctrl + Z (Command + Z on a Mac) ready in case you accidentally go too far.
Be careful not to over-reduce! You're throwing away pixels and, therefore, sacrificing detail. And you definitely don't want to enlarge the image after you've reduced it. Your image will turn to mush.
Combine the two images.
Copy and paste, drag and drop, or punt on fourth down.
Position the image more or less where you want it.
Choose Edit, Transform, Scale.
This command lets you fine-tune the relative size of the imported image with respect to its new home. A marquee with four corner handles surrounds the image.
Drag a corner handle to scale the image.
Shift + drag a handle to scale the image proportionally. After you release the handle, Photoshop previews how the resized image will look. Don't worry that the preview is a little choppy; the scaled image will be smooth.
Move your cursor inside the transform box and double-click to accept the image's new size.
If the scaled image looks choppy after you double-click, you probably have a preference set wrong. Choose Edit, Preferences, General, or press Ctrl + K (Command + K on a Mac) and then select the Bicubic (better) option from the Interpolation pop-up menu.
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