Stephen McAvoy <McA### [at] aolcom> wrote:
> Why only in some cases  PNG? Out of interest what your rational. 

  Because PNG files are usually much larger than JPEG files, specially
with photo-like images, and in such images there's no advantage in using
PNG just to show the image.
  In some cases PNG is essential because of its lossless nature, specially
in line-drawing-type images, where pixel accuracy is important. Also, in
this type of images the PNG is usually equally small, if not smaller, than
a JPEG with equivalent image quality.

  Moreover, even when posting a JPEG, it should be compressed as much as
possible as long as the JPEG artifacts are not too visible. It makes no
sense to compress a JPEG with quality 95% (making the file eg. 300 kilobytes
long) when compressing it with something like quality 60% (making the file
eg. 100 kilobytes long) does not result in a much different image.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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