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18 lines
983 B
Plaintext
18 lines
983 B
Plaintext
"Jpegpixi" is short for "JPEG pixel interpolator". The intent of
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the program is to interpolate pixels in JFIF images (commonly refered
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to as "JPEG images"). This is useful to correct images from a digital
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camera with CCD defects. For example, if one pixel is always bright
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green, this pixel can be interpolated away with jpegpixi.
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Jpegpixi is unique in that it tries to preserve the quality of the
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JFIF image as much as possible. Usual graphics programs decode JFIF
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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, does not decode and re-encode the image, but manipulates the
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encoded image data (known as the "DCT coefficients"). Therefore,
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the blocks (typically 8x8, 8x16, or 16x16 pixel areas) which contain
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the pixels to be interpolated are minimally disturbed, and other
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blocks remain pixel-by-pixel identical to the original image.
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WWW: http://www.zero-based.org/software/jpegpixi/
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