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Adobe's DNG SDK provides a software library for encoding and decoding lossless JPEG with up to 16 bits per sample. ISO/IEC Joint Photography Experts Group maintains a reference software implementation which can encode both base JPEG (ISO/IEC 10918-1 and 18477-1) and JPEG XT extensions (ISO/IEC 18477 Parts 2 and 6-9), as well as JPEG-LS (ISO/IEC ...
This conversion is sometimes referred to as developing a raw image (by analogy with the process of film development) since it renders raw image sensor data (a "digital negative") into a viewable form. A number of other image processing programs use dcraw internally to enable them to read raw files. Development of dcraw began on February 23, 1997.
In 2019, libjpeg-turbo became the ISO and ITU endorsed reference implementation for the JPEG format. [ 14 ] In April 2024, Google introduced Jpegli , a new JPEG coding library that offers enhanced capabilities and a 35% compression ratio improvement at high quality compression settings, while the coding speed is comparable with MozJPEG.
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
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.
Since the ISO system combines the newer ASA and DIN definitions, this conversion is also necessary when comparing older ASA and DIN scales with the ISO scale. The picture shows an ASA/DIN conversion in a 1952 photography book [ 70 ] in which 21/10° DIN was converted to ASA 80 instead of ASA 100.
Like any resampling operation, changing image size and bit depth are lossy in all cases of downsampling, such as 30-bit to 24-bit or 24-bit to 8-bit palette-based images. While increasing bit depth is usually lossless, increasing image size can introduce aliasing or other undesired artifacts.
A computer file format for coloured images, restricted to 256 colours and useful for small file-size. [8] GN: Guide number. A value indicating the power of an electronic flash apparatus, and used to estimate exposure. GN = distance × f-number. One needs to specify the film or sensor ISO speed, and it is conventional to quote for ISO 100/21°.