![]() You can use imfinfo to retrieve information about the image file. This should have been automatically placed in a folder on your MATLAB path when you installed MATLAB. ![]() the "Cat’s Eye Nebula," in the file ngc6543a.jpg. MATLAB includes a JPEG image of the complex planetary nebula NGC6543A, a.k.a. The three principal image I/O functions in MATLAB are imread (for reading graphics files), imwrite(for writing data to a graphics file format), and imfinfo (for retrieving information about a specific graphics file). Can have multiple images in one file (animations). Similar to bmp, up to 24-bit color and lossless compression.Ī data interchange format championed by the National Center for Supercomputing Applications. Similar to GIF, very efficient lossless compression, supporting variable transparencies (alpha channels), and gamma correction, but not animations. Use for logos, bullets, or cliparts where few colors are used. Limited to 256 colors that are "dithered" to look like more colors. Does not work so well with photographic images or images with continuous tones. Works well for illustrations or clip-arts that have large areas of flat colors. ![]() Very common and used extensively on the Internet. Can support various compression algorithms in compressed modes. Can contain information about colorimetry calibration, gamut tables, etc., such as occurs with remote sensing and multi-spectral applications. Originally created in the 1980s to support data output from scanners (raster scan). Compression can result in noticeable loss of image quality in some images or annoying "artifacts." Compression ratios of 25 or 30 to 1 with photographic images producing good results are not uncommon, but the more you compress, the poorer the picture quality. Created to support the photographic industry. Originally uncompressed, run-length encoding (lossless) compression is now supported.Ģ4-bit (true color) support. If your image contains only a few colors or is made up of mostly constant color areas, then the color-mapped formats, e.g., PNG and GIF, will do well however, if you are sharing your images on the Internet, you will probably choose a format that will compress your data and reduce file size. If you are generating an image file for use by others, you will likely choose a format that is commonly viewable with most image editing software. ![]()
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