17 lines
951 B
Text
17 lines
951 B
Text
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Jpegpixi is short for JPEG Pixel Interpolator. The intent of the
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program is to interpolate pixels (single pixels, dots, stripes) in
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JPEG images. This is useful to correct images from a digital camera
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with CCD defects. For example, if one pixel is always bright green,
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this pixel can be interpolated with jpegpixi.
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Jpegpixi is unique in that it tries to preserve the quality of the
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JPEG image as much as possible. Usual graphics programs decode JPEG
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images when they are loaded, and re-encode them when they are saved,
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which results in an overall loss of quality. Jpegpixi, on the other
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hand, only decodes the DCT blocks (typically 8x8, 16x8, or 16x16 pixel
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areas) which contain pixels to be interpolated, and when it re-encodes
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them, it uses exactly the same parameters with which the image has
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originally been encoded. These blocks are therefore only minimally
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disturbed, and other blocks remain pixel-by-pixel identical to the
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original image.
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