What would happen to a jpeg image if I open it up and save it at 75% quality.
Reopen the image and save it again at 75%? Would there be loss to quality?
Seems like it would. Once I opened a picture I saved at 75% before and saved
it at 100%. The file size increased. I don't understand that. There are
times when I want to open a jpeg just to resize the picture, and then save it
again - but I don't want to lose any more quality - and I don't want to
increase the file size compared to what it was before. How do I go about
Also, where can I find documentation on the web where I can lern all about
Thanks in advance.
On Wednesday 04 April 2001 19:13, you wrote:
> Rupert -
> An indexed image can contain any number of colors (3, 7, 21, 86,
> . . .) up to the maximum limit of 256.
> In brief: GIF is a simple indexed format, one byte per pixel,
> which limits the total number of colors to 256 maximum. It will
> allow for on/off transparency; one color can be called
> transparent. JPEG allows for millions of colors (3 bytes per
> pixel, actually, one each for Red, Green, and Blue), but its
> compression scheme is lossy, trading fine color detail for
> reduced size. The usual rule of thumb is GIF for line art and
> pictures with large areas of a constant color, JPEG for images
> with lots of detail such as photographs.
> Nothing really beats loading an image into the Gimp and just
> playing with it. There's always new stuff to be discovered.
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