Concretely, the composite is rendered and filtered as one image, so the effect is applied to the finished artwork rather than to any single layer. You pick the effect and its strength and the transform is applied to the whole file at once.
Which effects are available?
+
Grayscale, sepia, invert, blur, sharpen, and brightness, contrast and saturation adjustment. They can be combined, and combining them in one pass is better than running the tool repeatedly.
Does the source format change how a filter looks?
+
It can. PSD is Photoshop native — layers, masks, adjustment layers and blend modes stay live and editable, which no flat image format can represent. Colour depth and the palette model in particular decide how smoothly a gradient or a blur can be represented.
Anything specific to PSD to keep in mind?
+
Yes — layers, masks and adjustment layers are live objects rather than pixels, so a tool either preserves them or composites them down — there is no middle option. That is often the difference between an effect looking clean and looking banded.
Can I undo a filter after downloading?
+
No — the effect is baked into the output pixels, which is the point of applying it. Keep the original file; that is your undo. Grayscale and blur in particular discard information that genuinely cannot be recovered.
Can I apply the same look to a whole set?
+
Yes. One filter configuration is applied across the batch, which is how you get a visually consistent gallery rather than a set of individually-tweaked images that almost match.
