Jpeg how many bits

A few medium format cameras can even capture bit RAW files. Some photo editing programs will let you work with RAW files directly, but with others, including Photoshop, Affinity Photo and various plug-ins, you will need to process the RAW file into an editable image first. A better alternative is to produce a bit TIFF image.

This will be a much larger file, but far better for image editing. There seems to be a lot of confusion around this. This seems to be based on a spurious correlation between bit depth and dynamic range and a misunderstanding of how digital capture works. Sensors do not capture data in bits. Such a file might also contain a color table sometimes called a color palette. A color table maps numbers in the bitmap to specific colors. The following illustration shows an enlarged image along with its bitmap and color table.

Each color in the table is represented by a bit number: 8 bits for red, 8 bits for green, and 8 bits for blue. Look at the pixel in row 3, column 5 of the image.

The corresponding number in the bitmap is 1. The color table tells us that 1 represents the color red, so the pixel is red. All the entries in the top row of the bitmap are 3. The color table tells us that 3 represents blue, so all the pixels in the top row of the image are blue.

Some bitmaps are stored in bottom-up format; the numbers in the first row of the bitmap correspond to the pixels in the bottom row of the image. A bitmap that stores indexes into a color table is called a palette-indexed bitmap.

Some bitmaps have no need for a color table. For example, if a bitmap uses 24 bits per pixel, that bitmap can store the colors themselves rather than indexes into a color table. The following illustration shows a bitmap that stores colors directly 24 bits per pixel rather than using a color table. The illustration also shows an enlarged view of the corresponding image.

There are many standard formats for saving bitmaps in files. BMP is a standard format used by Windows to store device-independent and application-independent images. The number of bits per pixel 1, 4, 8, 15, 24, 32, or 64 for a given BMP file is specified in a file header. BMP files with 24 bits per pixel are common. GIF is a common format for images that appear on Web pages.

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