On 12/18/2009 05:48 PM, Sven Neumann wrote: > Hi, > > On Fri, 2009-12-18 at 15:39 -0500, Jay Smith wrote: > >> By the way, if possible, I would like to do this parasite removal on >> tens of thousands of files. Perhaps as the 'exec' of a 'find' command. > > I don't understand why you are even considering to use GIMP then. If all > you care about is the image data, then a simple tifftopnm | pnmtotiff > will probably do the trick. > > > Sven
Hi Sven, I am afraid I am not 100% following what you are saying. Perhaps I miscommunicated. Or perhaps I am just not filling in assumed knowledge well enough. I want to use Gimp as an image editor. However, there are thousands of images that have been created over the years on different versions of various programs, some of which have varying ICC profiles embedded. And, then, importantly, there are apparently some that have corrupted ICC profiles which were caused by a major data corruption event years ago. So, I was asking about how to get to sRGB for all them (i.e. remove the color profile). You had mentioned some methods, but I don't have enough information on how to use those methods. Perhaps I am really missing something -- in Gimp is there a method / command to (one at a time) remove the color profile parasite? That question was never answered in the archived newsgroup messages I have read. Instead there is reference to changing it to sRGB which apparently accomplishes the same thing as removing the color profile parasite. I thought that I had once done some method/command in Gimp to remove the color profile parasite, but perhaps I am mis-remembering. My goals are two-fold: a) When I find an individual image with a corrupted profile, I wish to remove the color profile parasite. (Changing to sRGB is not an option due to the previously discussed problem that it is a corrupted file and of course the plug-in is not always going to be happy with it.) I am no farther along in understanding whether Gimp has a tool to do this. b) I would like to find a method to remove color profile parasites on thousands of images, via the command line. You have suggested trying "tifftopnm | pnmtotiff" do to this. I will experiment with that, but I have a concern as noted below. Based on your most recent recommendation, I looked at http://netpbm.sourceforge.net/doc/tifftopnm.html and I am not sure how this helps me, unless you are suggesting to ROUNDTRIP using these two programs. However, I noted it said [below] that theoretically you can lose information in certain cases. I have no idea if my images would be affected by that. "The PNM output has the same maxval as the Tiff input, except that if the Tiff input is colormapped (which implies a maxval of 65535) the PNM output has a maxval of 255. Though this may result in lost information, such input images hardly ever actually have more color resolution than a maxval of 255 provides and people often cannot deal with PNM files that have maxval > 255. By contrast, a non-colormapped Tiff image that doesn't need a maxval > 255 doesn't have a maxval > 255, so when tifftopnm sees a non-colormapped maxval > 255, it takes it seriously and produces a matching output maxval. Another exception is where the TIFF maxval is greater than 65535, which is the maximum allowed by the Netpbm formats. In that case, tifftopnm uses a maxval of 65535, and you lose some information in the conversion." Thanks. Jay _______________________________________________ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
