I don't know the technicalities, but it seems to me that...The two commonest ways to compress an image are:
- downsample: ie. reduce number of pixels;
- more lossy: ie. reduce JPEG quality.
I'm amazed at how good JPEG compression is, even at its worst setting. If you reduce the pixel count and use a moderate JPEG compression it will look rough, whereas keeping a high pixel count and using extreme JPEG compression seems to do a better job.
I just use 'Resize Image' and the 'Quality' slider when saving as a .jpg. You can tell I don't have Photoshop...
(- downsample: ie. reduce number of pixels;
- more lossy: ie. reduce JPEG quality.
I'm amazed at how good JPEG compression is, even at its worst setting. If you reduce the pixel count and use a moderate JPEG compression it will look rough, whereas keeping a high pixel count and using extreme JPEG compression seems to do a better job.
I just use 'Resize Image' and the 'Quality' slider when saving as a .jpg. You can tell I don't have Photoshop...
Bee Nice |-|,
Wed 1 Apr 2009, 11:42,
archived)