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2. Compression artifact - Wikipedia

   en.wikipedia.org/wiki/Compression_artifact

   A compression artifact (or artefact) is a noticeable distortion of media (including images, audio, and video) caused by the application of lossy compression. Lossy data compression involves discarding some of the media's data so that it becomes small enough to be stored within the desired disk space or transmitted ( streamed ) within the ...

3. Perspective distortion - Wikipedia

   en.wikipedia.org/wiki/Perspective_distortion

   Perspective distortion takes two forms: extension distortion and compression distortion, also called wide-angle distortion and long-lens or telephoto distortion, [1] when talking about images with the same field size. Extension or wide-angle distortion can be seen in images shot from close using a wide-angle lens (with an angle of view wider ...

4. Image compression - Wikipedia

   en.wikipedia.org/wiki/Image_compression

   Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other digital data.

5. Fatpaint - Wikipedia

   en.wikipedia.org/wiki/Fatpaint

   Fatpaint is a free, online graphic design and desktop publishing software product and image editor. It includes integrated tools for creating page layout , painting, coloring and editing pictures and photos , drawing vector images , using dingbat vector clipart , writing rich text , creating ray traced 3D text logos and displaying graphics on ...

6. Wikipedia:Non-free content/Image size calculator - Wikipedia

   en.wikipedia.org/.../Image_size_calculator

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

7. 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.