Here are some tools I recommend:
- HotCat – make categorizing images on Commons A LOT less painful.
- VisualFileChange.js – an invaluable tool for any tedious, repetitive task.
- G'MIC (with GIMP) – helpful in image cleanup with several advanced denoising methods, region inpainting (for watermark removal), sharpening, etc.
- Wavelet decompose plugin – split an image to different levels of detail, each of which can be edited in parallel. Very useful in many situations.
- Image registration plugin – automatically aligns two layers containing the same image with sub-pixel precision.
- FFT plugin for Category:Images containing regular noise.
Here I have collected a few of the templates for the watermarks I have removed from any watermarked images.
To use them, drop them on the watermarked image in Gimp or Photoshop and align them with the watermark. If you use the XCF or PSD file, then that's it. If you use the "divide" or "substract" layer versions, then you will need to set the layer blending mode of the that template image respectively. For templates where I have provided only a divide layer and the watermark appears brighter than the background in the watermarked image, do "invert colors" before and after using the template. For JPEG images you will most likely need to blur or clone over any remaining JPEG artifacts.
|Image source||Watermarked example||XCF (for GIMP)||PSD (for Photoshop)||Subtract layer only||Divide layer only||Other||Original watermark|
|airliners.net||1024px, 1200px, 1280px|
|Provincial Archives of Alberta||||xcf||psd||div||original|
|Lunate1759 (talk · contribs)||||xcf||psd||sub||div||original|
|Národní galerie v Praze||xcf||psd||sub||div||original|
|Subway06~commonswiki (talk · contribs)||xcf||psd||sub||div||original|
|ua.vlasenko.net||div||mask for inpainting|
All of the above watermarks can be also directly accessed from this shared folder.