Concretely, SVG filters are declarative elements in the markup rather than baked pixels, so a blur or a colour matrix is added as an instruction the renderer executes — and stays editable and resolution-independent. 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. SVG is XML geometry rather than pixels, so it scales to any size without blurring but has no pixel grid to sample from. Colour depth and the palette model in particular decide how smoothly a gradient or a blur can be represented.
Anything specific to SVG to keep in mind?
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Yes — nothing is sampled: the file is edited as text, so the result is still infinitely scalable and still diffable in version control. 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.
