Hi gimpusers, >> I am just astonished that I have to set such extreme quality values to >> get a reasonable sized file.
> Very likely the TIFF files are 1 bit per pixel (only black or white, > with no gray). JPEG supports a minimum of 8 bits per pixel, so right > away, with equivalently efficient compression, the JPEGs are going to be > 8 times as large. I think Ernie answered the question. But here's some additional thoughts, that may or may not help solve the issue :-) Wouldn't Image > Properties provide some additional numerical information to concretely explain file sizes. Some tidbits: - Only save an image using a lossy compression once all other image editing has been completed, since many image manipulations can amplify compression artifacts. - Ensure that image noise levels are as low as possible, since this will produce dramatically smaller JPEG files. http://www.cambridgeincolour.com/tutorials/imagetypes.htm - JPEG Compression: The real story. http://www.tawbaware.com/maxlyons/jpegcomp.htm - Color data mode(Bits per pixel) TIF RGB - 24 or 48 bits, Grayscale - 8 or 16 bits, Indexed color - 1 to 8 bits, Line Art (bilevel)- 1 bit PNG RGB - 24 or 48 bits, Grayscale - 8 or 16 bits, Indexed color - 1 to 8 bits, Line Art (bilevel) - 1 bit JPG RGB - 24 bits, Grayscale - 8 bits GIF Indexed color - 1 to 8 bits http://www.scantips.com/basics09.html -- __________________________ DJ _______________________________________________ Gimp-user mailing list [email protected] https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
