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

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.

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