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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.
Data in a RAW-file is structured according to the Bayer filter's pattern in cameras that use a single image sensor. Debayering, the process of obtaining bitmap data from a RAW-image is always a lossy operation. [citation needed] In addition, some downsampling is always performed, again reducing image information.
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.
In GIMP 2.8, the Convert Image to Indexed Colors Option (Image→Mode→Indexed..) allows generation of an optimum palette with a choice in the number of colors from 2 to 256, the option of using a web-optimized palette, using a black and white palette (1 bit) or using a custom palette. It allows unused colors to be removed from the palette and ...
This can be avoided by only producing lossy files from (lossless) originals and only editing (copies of) original files, such as images in raw image format instead of JPEG. If data which has been compressed lossily is decoded and compressed losslessly, the size of the result can be comparable with the size of the data before lossy compression ...
JPEG greatly reduces the amount of data required to represent an image at the cost of a relatively small reduction in image quality and has become the most widely used image file format. [35] [36] Its highly efficient DCT-based compression algorithm was largely responsible for the wide proliferation of digital images and digital photos. [37]
Image viewer, converter, organizer and editor capable of importing around 200 and exporting 80 different image file types. Compatible with many Photoshop plug-ins Thorsten Lemke 1992: 11.5.1 July 1, 2021: Proprietary: GraphicsMagick: Commandline image converter and editor GraphicsMagick Group 2002: 1.3.45 [13] 2024-08-27 Free MIT: gThumb
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 ...