Questions tagged [jpeg]

JPEG is a lossy image compression format, suitable for photographs and other natural images. It attempts to compress the image while retaining its visual appearance, while allowing the compressor to trade image quality for file size.

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How do 2D DCT basis functions interact to produce 8x8 JPEG tiles?

This section is a bit of an intro. If you want to skip directly to where the problem is explicitly outlined, skip to the bottom of this post. Please note that I'm not hip with mathematical lingo, so ...
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How to remove artefacts from this image?

There is some vertical banding near the tree trunks in the following image. Is there a way remove this type of artefact, preferably using Mathematica?
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2D DWT computation order

In 2D the discrete wavelet transform (DWT) of an image using lifting based 5/3 filter, if I perform a row-wise operation first then perform column-wise operation then I will get 4 sub-band LL, LH and ...
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Need 600dpi JPEG file smaller than 5MB

In order to submit a document to an online website, they require the following: Scan the US letter-size hard-copy document at 600 dpi in greyscale Provide a JPEG, JPG, or PNG file of the scan with a ...
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How doesn't JPEG huffman table contain 256 codes?

Here are the DHT entries I got from JPEG snoop: ...