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tip precize resize

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tip precize resize peter.mlich@volny.cz 13 Jul 13:37
  tip precize resize Ofnuts 14 Jul 19:44
peter.mlich@volny.cz
2016-07-13 13:37:25 UTC (over 8 years ago)

tip precize resize

1.
Png (height about 500)
-> resize image (cubic, height 168 - double) -> sharpen 20%
-> resize image (linear, height 84) -> sharpen 20%

Sharpen not need, but i use it. This create better text, you can see logo http://www.slu.cz/fpf/cz/site/pict/logo-fpf-cz-web-new-220x84.png

2. You Sin (Lanzoc) method not good, i see better in old dos program.

3. Resize by height/8 in jpg, linear can easy realize by 0. coeficient of dct transform (dc). This coeficient is suma all 8x8 point in matrix / 16. May be this information is usable for something, fast miniature of jpeg-image or something other.

Peter

Ofnuts
2016-07-14 19:44:08 UTC (over 8 years ago)

tip precize resize

On 13/07/16 15:37, peter.mlich@volny.cz wrote:

1.
Png (height about 500)
-> resize image (cubic, height 168 - double) -> sharpen 20%
-> resize image (linear, height 84) -> sharpen 20%

Sharpen not need, but i use it. This create better text, you can see logo http://www.slu.cz/fpf/cz/site/pict/logo-fpf-cz-web-new-220x84.png

2. You Sin (Lanzoc) method not good, i see better in old dos program.

3. Resize by height/8 in jpg, linear can easy realize by 0. coeficient of dct transform (dc). This coeficient is suma all 8x8 point in matrix / 16. May be this information is usable for something, fast miniature of jpeg-image or something other.

Peter

Have you got the URL to the original image?