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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...

    If the new version is too sharp, you can utilize the blur filter or tool to fix this, or use Colors > Levels to mess with the Alpha channel. Once it looks correct, save the image as a PNG. Then, to reduce file size, run it through a program like ImageMagick that supports 8-bit PNGs with alpha transparency, in order to remove any unnecessary ...

  3. SQLite - Wikipedia

    en.wikipedia.org/wiki/SQLite

    Adobe Systems uses SQLite as its file format in Adobe Photoshop Lightroom, a standard database in Adobe AIR, and internally within Adobe Reader. [11] As with much Apple software, Photos uses SQLite internally. [53] Audacity uses SQLite as its file format, as of version 3.0.0. [54] Evernote uses SQLite to store its local database repository in ...

  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. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    Libpcap File Format (nanosecond-resolution) [2] A1 B2 3C 4D (big-endian) ¡²<M: 0A 0D 0D 0A ␊␍␍␊ 0 pcapng PCAP Next Generation Dump File Format [3] ED AB EE DB: í«îÛ: 0 rpm RedHat Package Manager (RPM) package [4] 53 51 4C 69 74 65 20 66 6F 72 6D 61 74 20 33 00: SQLite format 3␀ 0 sqlitedb sqlite db SQLite Database [5] 53 50 30 ...

  6. Data compression - Wikipedia

    en.wikipedia.org/wiki/Data_compression

    DCT is the basis for JPEG, a lossy compression format which was introduced by the Joint Photographic Experts Group (JPEG) in 1992. [34] 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 .

  7. Lossy compression - Wikipedia

    en.wikipedia.org/wiki/Lossy_compression

    While data reduction (compression, be it lossy or lossless) is a main goal of transform coding, it also allows other goals: one may represent data more accurately for the original amount of space [5] – for example, in principle, if one starts with an analog or high-resolution digital master, an MP3 file of a given size should provide a better ...

  8. Image conversion - Wikipedia

    en.wikipedia.org/wiki/Image_conversion

    More expensive digital cameras usually offer the option to shoot in Raw image format. RAW is not a standardized format, in fact, RAW-formats even differ between camera models from the same vendor [citation needed]. Data in a RAW-file is structured according to the Bayer filter's pattern in cameras that use a single image sensor.

  9. Image file format - Wikipedia

    en.wikipedia.org/wiki/Image_file_format

    This characteristic sometimes results in a smaller file size for some lossless formats than lossy formats. For example, graphically simple images (i.e. images with large continuous regions like line art or animation sequences) may be losslessly compressed into a GIF or PNG format and result in a smaller file size than a lossy JPEG format.