Concretely, the filter is applied per file with the right decoder for each format, so a mixed batch comes out with one consistent look. You pick the effect and its strength and the transform is applied to the whole file at once.
Which effects are available?
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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?
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It can. this format is read and written by the same streaming pipeline as everything else we support. Colour depth and the palette model in particular decide how smoothly a gradient or a blur can be represented.
Anything specific to Image to keep in mind?
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Yes — the pipeline reads the real format from the file header rather than the extension, so a mislabelled upload still works. That is often the difference between an effect looking clean and looking banded.
Can I undo a filter after downloading?
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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?
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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.
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