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2. Image editing - Wikipedia

   en.wikipedia.org/wiki/Image_editing

   Image editors may feature a number of algorithms which can add or remove noise in an image. Some JPEG artifacts can be removed; dust and scratches can be removed and an image can be de-speckled. Noise reduction merely estimates the state of the scene without the noise and is not a substitute for obtaining a "cleaner" image.

3. FastStone Image Viewer - Wikipedia

   en.wikipedia.org/wiki/FastStone_Image_Viewer

   FastStone Image Viewer is an image viewer and organizer software for Microsoft Windows, provided free of charge for personal and educational use. The program also includes basic image editing tools, [ 4 ] like cropping, color adjustment and red-eye removal.

4. Phantogram (optical illusion) - Wikipedia

   en.wikipedia.org/wiki/Phantogram_(optical_illusion)

   Phantograms, also known as Phantaglyphs, Op-Ups, free-standing anaglyphs, levitated images, and book anaglyphs, are a form of optical illusion.Phantograms use perspectival anamorphosis to produce a 2D image that is distorted in a particular way so as to appear, to a viewer at a particular vantage point, three-dimensional, standing above or recessed into a flat surface.

5. Perspective control - Wikipedia

   en.wikipedia.org/wiki/Perspective_control

   Picture of Notre Dame de Reims showing perspective distortion The same picture corrected. Perspective control is a procedure for composing or editing photographs to better conform with the commonly accepted distortions in constructed perspective. The control would: make all lines that are vertical in reality vertical in the image.

6. PhotoLine - Wikipedia

   en.wikipedia.org/wiki/PhotoLine

   Editing and color management in PhotoLine is mostly non-destructive. Image data in layers is preserved without loss of information regardless of the document's image mode or layer transformation. color depth, image resolution, color model, and ICC profile are preserved for each individual layer or group of layers. Layers can be cloned and ...

7. Anamorphosis - Wikipedia

   en.wikipedia.org/wiki/Anamorphosis

   There are two main types of anamorphosis: perspective (oblique) and mirror . More complex anamorphoses can be devised using distorted lenses, mirrors, or other optical transformations. More complex anamorphoses can be devised using distorted lenses, mirrors, or other optical transformations.