Re: [Gimp-user] Rotate increases PNG size x10 ! - next Q
Chris, On 2010-06-25 02:54, Chris Mohler wrote: On Thu, Jun 24, 2010 at 6:16 AM, Philip Rhoadesp...@pricom.com.au wrote: Confirmation of what is going on from the gurus would be appreciated! It was as I guessed - the scans are in grayscale mode but the contents are essentially a 1-bit image. Open a scan, do image-mode-bitmap, choose 1-bit palette. I had to do: image-mode-indexed-1bit Then rotate and save - the file size will be comparable to the original. OK, so now the next question is: If the original is recognised by identify as a 1 bit per pixel image, why doesn't Gimp keep it that way when opening the file? At 300dpi there is no real issue with jaggy edges - is it just a judgement call that a conversion to grey scale is likely to give the best result for most situations and the file size is a secondary consideration? Thanks, Phil. -- Philip Rhoades GPO Box 3411 Sydney NSW 2001 Australia E-mail: p...@pricom.com.au ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Rotate increases PNG size x10 ! - next Q
On Fri, Jun 25, 2010 at 4:45 PM, Philip Rhoades p...@pricom.com.au wrote: OK, so now the next question is: If the original is recognised by identify as a 1 bit per pixel image, why doesn't Gimp keep it that way when opening the file? At 300dpi there is no real issue with jaggy edges - is it just a judgement call that a conversion to grey scale is likely to give the best result for most situations and the file size is a secondary consideration? If the image was produced as 1bpp to begin with, I don't think converting to Greyscale will help a lot. Maybe with rotation, but otherwise, there should be little advantage. -- Branko Vukelić bg.bra...@gmail.com stu...@brankovukelic.com Check out my blog: http://www.brankovukelic.com/ Check out my portfolio: http://www.flickr.com/photos/foxbunny/ Registered Linux user #438078 (http://counter.li.org/) I hang out on identi.ca: http://identi.ca/foxbunny Gimp Brushmakers Guild http://bit.ly/gbg-group ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Rotate increases PNG size x10 ! - next Q
Branko, On 2010-06-26 00:54, Branko Vukelic wrote: On Fri, Jun 25, 2010 at 4:45 PM, Philip Rhoadesp...@pricom.com.au wrote: OK, so now the next question is: If the original is recognised by identify as a 1 bit per pixel image, why doesn't Gimp keep it that way when opening the file? At 300dpi there is no real issue with jaggy edges - is it just a judgement call that a conversion to grey scale is likely to give the best result for most situations and the file size is a secondary consideration? If the image was produced as 1bpp to begin with, I don't think converting to Greyscale will help a lot. Maybe with rotation, but otherwise, there should be little advantage. The question was - why does Gimp make the change automatically? - it shouldn't in my view. Thanks, Phil. -- Philip Rhoades GPO Box 3411 Sydney NSW 2001 Australia E-mail: p...@pricom.com.au ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
