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I downloaded bunch of images of leaves but a can't apply them properly, because they are basically squares. Should i use photoshop? Or blender has a way to cut them?
I would suggest to alpha-mask the images in Photoshop or Gimp but if you have your leaf on a black background, you can do it in blender like this.
Alternatively, you can download already masked leaf images from sites like textures.com.
May I suggest you make the color around the leaf from green and whatnot, to completely transparent and use a Transparent BSDF node if you are using Cycles:
Required, but never shown