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#2
February 7th 11, 11:51 PM
posted to alt.binaries.pictures.aviation
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Ads, pt 6
On Mon, 07 Feb 2011 06:52:28 -0600, Mitchell Holman wrote:
pt 6 of 10 While the posting of these images is very much appreciated, the particular compression method for them is not to be recommended. These images have substantial amounts of text material and JPEG compression, being based on the discrete cosine transform, is not suitable for text. Notice the fine "halo" that exists around each portion of text. This is an artifact of the DCT-based compression. For digital files that contain both images and text material, PNG is the common compression method of choice. PNG will not produce "halos" around text and the file sizes can be quite close to that produced by JPEG compression. 
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