Concretely, the per-pixel transform is applied and written back losslessly, so you can iterate on a look as many times as you like without accumulating any compression damage. 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. TIFF is the archival container: lossless LZW or DEFLATE, 16-bit-per-channel depth, CMYK, and multiple pages in a single file. Colour depth and the palette model in particular decide how smoothly a gradient or a blur can be represented.
Anything specific to TIFF to keep in mind?
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Yes — a single TIFF can hold several pages and 16-bit-per-channel data, so a tool has to decide whether to act on page one or on all of them. 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.
