Home > Archive > Compression > October 2006 > Re: "Real WMV", 148.50 mhz sample-rate, 1920 X 1080 progressive scan image,
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Re: "Real WMV", 148.50 mhz sample-rate, 1920 X 1080 progressive scan image,
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| Martin Heffels 2006-10-30, 6:56 pm |
| On 29 Oct 2006 19:57:53 -0800, "Radium" <glucegen1@excite.com> wrote:
>If it is the color-depth [instead of the
>image-resolution] that is compressed, then there will be no appearance
>of blocks [provided the image-resolution is sufficient] no matter how
>far the compression of color-depth is pushed.
That is incorrect. Look at for instance an area with very little gradation
in colour, like the sky. The compression algorhythms look at similar
colours, and declare one area a similar colour, even if it is slightly
different shade. If you compress too much, the range in which this is done,
is getting wider and wider, and upon decompressing you see large blocks of
colour, and then another block of a slightly different shade etc etc.
Really, you ask so many questions which you don't have to ask, because you
can try them out yourself with Photoshop/Gimp etc etc.
cheers
-martin-
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