Quote:
Originally Posted by raymo
I don't fully understand the ins and outs of downsizing my images for
posting on IIS.
How is it that some peoples' images are so large that I have to lower my
screen mag in order to see the whole image, and yet when I take mine down to the 200 limit they end up about 100mm across? I assume that there is some way of lowering the quality of the image, rather than just making it smaller, but retaining the original quality, so that it remains large enough to view without squinting at it. Perhaps I am using the wrong software, and there is software that reduces the quality rather than the physical size of the image. What is the best software to use?
raymo
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Compression to 200KB will greatly depend on the colours in your pic as well as the number of features, neb, etc... For example a small galaxy shot with a lot of black background will compress better than let's say a milkyway shot with a lot of colors, stars, nebs. Also monochrome might be a little lighter than colour. Finally the software you use to save as a compressed JPEG will defiitely make a difference too. The way I usually do it is post highres on a separate URL then change size to 1280 or 1024 wide for IIS than tweak the slider to go under 200KB. If it looks bad then reduce further the width. Try to keep quality above ~50%. I also vaguely recall that yellows or greens can be a problem when compressing JPEGs (Troy can elaborate).