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2. Help : How to reduce colors for saving a JPEG as PNG

   en.wikipedia.org/wiki/Help:How_to_reduce_colors...

   Sometimes, you find a drawing or similar image useful for a Wikipedia article, that was saved as a JPEG but should have been saved as a PNG.JPEG is good for images where the color changes fluidly throughout the image, like in a photograph, whereas PNG files are good for images with relatively few colors, such as a drawing of a flag, a chart, or a map; note that sometimes SVG is better.

3. Transparency (graphic) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(graphic)

   an image that is not rectangular can be filled to the required rectangle using transparent surroundings; the image can even have holes (e.g. be ring-shaped) in a run of text, a special symbol for which an image is used because it is not available in the character set, can be given a transparent background, resulting in a matching background.

4. GIMP - Wikipedia

   en.wikipedia.org/wiki/GIMP

   The GNU Image Manipulation Program, commonly known by its acronym GIMP (/ ɡ ɪ m p / ⓘ GHIMP), is a free and open-source raster graphics editor [3] used for image manipulation (retouching) and image editing, free-form drawing, transcoding between different image file formats, and more specialized tasks. It is extensible by means of plugins ...

5. Alpha compositing - Wikipedia

   en.wikipedia.org/wiki/Alpha_compositing

   A color spectrum image with an alpha channel that falls off to zero at its base, where it is blended with the background color.. In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. [1]

6. XCF (file format) - Wikipedia

   en.wikipedia.org/wiki/XCF_(file_format)

   supports XCF files that are compatible with GIMP 2.6 or 2.8, and when the color mode is RGB or grayscale Corel Photo-Paint: does not support layer mask or paths: can load multi-layer images, support some layer modes Photopea: Yes: online image editor which can open XCF files and convert to other formats including Photoshop's PSD: SDL2_image ...

7. Comparison of graphics file formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_graphics...

   Portable Pixmap File Format ASCII.ppm image/x-portable-pixmap Very easy to understand. Programs to analyze and write to this format are easily written. Yes PSD: Photoshop Document Adobe Systems.psd, .psb, .pdb,.pdd image/vnd.adobe.photoshop [6] Used mainly for storing image manipulation & editing data. No PSP: Paint Shop Pro Document Corel ...

8. ImageMagick - Wikipedia

   en.wikipedia.org/wiki/ImageMagick

   The software mainly consists of a number of command-line interface utilities for manipulating images. ImageMagick does not have a robust graphical user interface to edit images as do Adobe Photoshop and GIMP, but does include – for Unix-like operating systems – a basic native X Window GUI (called IMDisplay) for rendering and manipulating images and API libraries for many programming languages.

9. JPEG XL - Wikipedia

   en.wikipedia.org/wiki/JPEG_XL

   In addition to the eponymous codec library, it packages a suite of auxiliary tools, like the command line encoder cjxl and decoder djxl, the fast lossless-only encoder fjxl, the image codec benchmarking tool (speed, quality) benchmark_xl, as well as the GIMP and gdk-pixbuf plugin file-jxl. As of 2023 (v0.9.0) it also offers Google's jpegli, an ...