gimp cannot read multi-byte pgm files?
in [Linux Help]
|
From: unruh on 13 Feb 2010 18:11 I have some pgm files which have a max value of 4095 (ie 12 bits, which uses 2 bytes to store). But gimp complains that it cannot read a pgm file with more that 255 levels (8 bit) abnd that the pnm filter does not support it. (PNM image Message Invalid maximum value\Gimp message Opening '/tmp/dark.pgm' failed: PNM Image plug-in could not open image) The header of the file is P5 1920 1080 #Fri Feb 12 17:33:33 2010 4095 ....... (The dots are the start of the data) Since multibyte pgm are part of the standard, what is the problem? (http://netpbm.sourceforge.net/doc/pgm.html) Surely gimp is newer that 2000 when the 2 byte format apparently came in. Note that convert ( from ImageMagic) does seem to work, so if necessary I could always use convert to get it into some format gimp does understand. Thanks (gimp 2.4.7)
From: sid on 15 Feb 2010 12:50 unruh wrote: > I have some pgm files which have a max value of 4095 (ie 12 bits, which > uses 2 bytes to store). But gimp complains that it cannot read a pgm > file with more that 255 levels (8 bit) abnd that the pnm filter does not > support it. > (PNM image Message Invalid maximum value\Gimp message > Opening '/tmp/dark.pgm' failed: > PNM Image plug-in could not open image) > > The header of the file is > P5 > 1920 1080 > #Fri Feb 12 17:33:33 2010 > 4095 > ...... > (The dots are the start of the data) > > > > Since multibyte pgm are part of the standard, what is the problem? > (http://netpbm.sourceforge.net/doc/pgm.html) > Surely gimp is newer that 2000 when the 2 byte format apparently came in. > > Note that convert ( from ImageMagic) does seem to work, so if necessary > I could always use convert to get it into some format gimp does > understand. Well I clicked on your link which downloaded and opened the file in KolourPaint. Saved it from there onto the desktop and right clicked open with gimp and it opened without complaint? Mandriva 2010, gimp 2.6.7 -- sid RLU 300284 2010
From: furlan on 15 Feb 2010 14:25 On Mon, 15 Feb 2010 17:50:06 +0000, sid wrote: > unruh wrote: > >> I have some pgm files which have a max value of 4095 (ie 12 bits, which >> uses 2 bytes to store). But gimp complains that it cannot read a pgm >> file with more that 255 levels (8 bit) abnd that the pnm filter does >> not support it. >> (PNM image Message Invalid maximum value\Gimp message Opening >> '/tmp/dark.pgm' failed: >> PNM Image plug-in could not open image) >> >> The header of the file is >> P5 >> 1920 1080 >> #Fri Feb 12 17:33:33 2010 >> 4095 >> ...... >> (The dots are the start of the data) >> >> >> >> Since multibyte pgm are part of the standard, what is the problem? >> (http://netpbm.sourceforge.net/doc/pgm.html) Surely gimp is newer that >> 2000 when the 2 byte format apparently came in. >> >> Note that convert ( from ImageMagic) does seem to work, so if necessary >> I could always use convert to get it into some format gimp does >> understand. > > Well I clicked on your link which downloaded and opened the file in > KolourPaint. Saved it from there onto the desktop and right clicked open > with gimp and it opened without complaint? > > Mandriva 2010, gimp 2.6.7 Thanks for the update on this. I was able to get the file via Firefox. I also tried to open it via the GIMP w/ the same result as the OP. I just snagged KolourPaint and installed it and will try it in that application... It opened and all I see is BLACK. ciao, f -- aa #2301 "I'd take the awe of understanding over the awe of ignorance any day" --Douglas Adams
From: unruh on 15 Feb 2010 14:53 On 2010-02-15, furlan <magicus23REMOVE-THIS(a)gmail.com> wrote: > On Mon, 15 Feb 2010 17:50:06 +0000, sid wrote: > >> unruh wrote: >> >>> I have some pgm files which have a max value of 4095 (ie 12 bits, which >>> uses 2 bytes to store). But gimp complains that it cannot read a pgm >>> file with more that 255 levels (8 bit) abnd that the pnm filter does >>> not support it. >>> (PNM image Message Invalid maximum value\Gimp message Opening >>> '/tmp/dark.pgm' failed: >>> PNM Image plug-in could not open image) >>> >>> The header of the file is >>> P5 >>> 1920 1080 >>> #Fri Feb 12 17:33:33 2010 >>> 4095 >>> ...... >>> (The dots are the start of the data) >>> >>> >>> >>> Since multibyte pgm are part of the standard, what is the problem? >>> (http://netpbm.sourceforge.net/doc/pgm.html) Surely gimp is newer that >>> 2000 when the 2 byte format apparently came in. >>> >>> Note that convert ( from ImageMagic) does seem to work, so if necessary >>> I could always use convert to get it into some format gimp does >>> understand. >> >> Well I clicked on your link which downloaded and opened the file in >> KolourPaint. Saved it from there onto the desktop and right clicked open >> with gimp and it opened without complaint? I suspect that KolourPaint saved it in a different format. Do head filename on the file that KolourPaint saved and post it please. >> >> Mandriva 2010, gimp 2.6.7 > > Thanks for the update on this. I was able to get the file via Firefox. I > also tried to open it via the GIMP w/ the same result as the OP. I just > snagged KolourPaint and installed it and will try it in that > application... > > It opened and all I see is BLACK. It was a picture taken with the camera with the lens cap on. There should be a few pixels which are not quite black (ie if you increase the brightness, you should see a few pixels poke up and eventually a mottled noise floor. The noise floor has pixel brightness values of about 20 out of 4095. The maximum brightness of any single pixel is about 700 out of 4095.
From: Michael Soibelman on 11 Mar 2010 00:53 On Mon, 15 Feb 2010 17:50:06 +0000, sid wrote: > unruh wrote: > >> I have some pgm files which have a max value of 4095 (ie 12 bits, which >> uses 2 bytes to store). But gimp complains that it cannot read a pgm >> file with more that 255 levels (8 bit) abnd that the pnm filter does >> not support it. >> (PNM image Message Invalid maximum value\Gimp message Opening >> '/tmp/dark.pgm' failed: >> PNM Image plug-in could not open image) >> >> The header of the file is >> P5 >> 1920 1080 >> #Fri Feb 12 17:33:33 2010 >> 4095 >> ...... >> (The dots are the start of the data) >> >> >> >> Since multibyte pgm are part of the standard, what is the problem? >> (http://netpbm.sourceforge.net/doc/pgm.html) Surely gimp is newer that >> 2000 when the 2 byte format apparently came in. >> >> Note that convert ( from ImageMagic) does seem to work, so if necessary >> I could always use convert to get it into some format gimp does >> understand. > > Well I clicked on your link which downloaded and opened the file in > KolourPaint. Saved it from there onto the desktop and right clicked open > with gimp and it opened without complaint? > > Mandriva 2010, gimp 2.6.7 Yes but when saving Kolourpaint gives a warning that (re)saving in this format (pgm) may reduce the number of colors ! This is why Gimp no longer has a problem opening the file as the number of colors no longer exceeds the maximum that Gimp allows... OSIS (or so it seems) Perhaps the previous poster didn't get/see this warning but I suspect that is what happened. Also, it's likely kolourpaint uses ImageMagick as a backend to convert/read the file in...and then export it. When looking at the image properties in Gimp I see this: 1920 x 1080 pixels 72 ppi Grayscale 2.0 MB PNM (not pgm) That's AFTER saving from kolourpaint.
|
Pages: 1 Prev: Throw out my parallel port flatbed scanner? Next: Help after update on mandriva |