[vox-tech] Fwd: Re: Forcing a greyscape JPEG into RGB colorspace?
Orson posted from a non-subscribed address, so passing along to the list on his behalf: - Forwarded message from vox-tech-boun...@lists.lugod.org - Date: Mon, 14 Jun 2010 16:12:11 -0700 From: vox-tech-boun...@lists.lugod.org Subject: Auto-discard notification To: vox-tech-ow...@lists.lugod.org The attached message has been automatically discarded. Date: Mon, 14 Jun 2010 17:07:00 -0600 From: Orson Jones or...@afriskito.net Subject: Re: [vox-tech] Forcing a greyscape JPEG into RGB colorspace? To: vox-tech@lists.lugod.org What are you using to determine the type of image? From what I have been reading, imagemagick tells you about the contents of the image, not the actual format it is saved in. $ convert grey.jpg -type TrueColor converted.jpg $ identify -verbose converted.jpg |grep Type: Type: Grayscale $ djpeg -v -outfile /dev/null grey.jpg 21 |grep components Start Of Frame 0xc0: width=164, height=238, components=1 Start Of Scan: 1 components $ djpeg -v -outfile /dev/null converted.jpg 21 |grep components Start Of Frame 0xc0: width=164, height=238, components=3 Start Of Scan: 3 components (This shows that there are 3 components and not 1 like the grey image.) Orson - End forwarded message - -- -bill! Sent from my computer ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Fwd: Re: Forcing a greyscape JPEG into RGB colorspace?
On Mon, Jun 14, 2010 at 04:27:04PM -0700, Bill Kendrick wrote: snip What are you using to determine the type of image? From what I have been reading, imagemagick tells you about the contents of the image, not the actual format it is saved in. $ convert grey.jpg -type TrueColor converted.jpg $ identify -verbose converted.jpg |grep Type: Type: Grayscale I have no idea what the 3rd party uses, but we get reports back. I forget (since it's been about 2 months) exactly what I was doing to try and determine whether the resulting JPEG was 'right'. $ djpeg -v -outfile /dev/null grey.jpg 21 |grep components Start Of Frame 0xc0: width=164, height=238, components=1 Start Of Scan: 1 components $ djpeg -v -outfile /dev/null converted.jpg 21 |grep components Start Of Frame 0xc0: width=164, height=238, components=3 Start Of Scan: 3 components (This shows that there are 3 components and not 1 like the grey image.) So the trick might be the -type TrueColor option... I'll if that helps. Thanks! -bill! ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
