[Gimp-user] PNG file gamma again. Bug in png save?
GIMP saves the file gamma 0.4545 even if I uncheck its saving in PNG save dialog. Both checked and unchecked will save the gamma 0.4545. xloadimage shows both saves equally dark, with wrong intensities. Version: GNU Image Manipulation Program version 2.4.5 ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] pnmtopng problem
(I use pnmtopng because GIMP cannot save PNG images properly.) What pnmtopng tries to say below? How to fix it? All PNM images have the same P6 format. pngtopnm Screenshot-79.png | pnmcut 7 50 1012 688 | pnmtopng 09.png pngtopnm Screenshot-80.png | pnmcut 7 50 1012 688 | pnmtopng 10.png pnmtopng: 256 colors found 09.png: PNG image data, 1012 x 688, 8-bit/color RGB, non-interlaced 10.png: PNG image data, 1012 x 688, 8-bit grayscale, non-interlaced convert of GraphicsMagick does the conversion properly with image 10. Juhana ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] File gamma 0.4545? And pnmtopng.
What an earth. I found that GIMP has placed file gamma 0.4545 to PNG images without my will. $ xloadimage x.png x.png is 1120x840 PNG image, color type RGB, 8 bit, file gamma 0.4545 The image is displayed too dark. The brighter image is correct because xloadimage shows the original x.ppm that way. I found this problem only now because GIMP, eog, gqview, and webbrowsers ignores the file gamma. Is it wrong to ignore the file gamma? How to delete the file gamma with GIMP or with command line converters? What convert -gamma 1.0 would do for x.png? (1) Fix the file gamma to 1.0? (2) Modify the pixel values? Similar questions about GIMP and other programs. How to configure GIMP to not set the file gamma? I have never set the gamma value. I have always wanted 1:1 correspondence between the file and the display. Who GIMP developer uses 0.4545 gamma? :-) BTW, I remade the png by not using GIMP: cat x.ppm | pnmtopng x.png $ xloadimage x.png x.png is 1120x840 PNG image, color type PALETTE, 8 bit The PNG image should be RGB, not PALETTE! Somebody should fix the pnmtopng. Juhana ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Creating texture images?
How to convert photos taken with a cheap Canon camera to what can be used as textures in games? See GPU Gems 3 for linear space images and how they are used in the rendering. Do we know enough about how a particular camera works? How to measure how a camera works if that is necessary in the process? Juhana ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] dds/dxt source code?
Hello. The plugin gimp-dds-1.2.1 seems to use either graphics card or dxtn.dll/libtxc_dxtn.so binaries for decompression. Both are missing from my computer. Anyone has written an open source decompressor? Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Acquiring multiple screenshots?
The periodic screenshot script is at http://registry.gimp.org/file/periodic_screenshot.scm?action=downloadid=8922 but it fails because it cannot find plug-in-screenshot procedure. I could not find any other screenshot acquire procedure. Help. Looks like I'm able to write a suitable script myself if such a screenshot procedure is available. What procedure GIMP itself uses in File/Acquire/Screenshot tool? Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Acquiring multiple screenshots?
plug-in-winsnap, but I am not sure if it can be called non-interactively. I cannot get it work interactively nor noninteractively. Anyone could give a try? If you could add the proper procedure (e.g., noninteractive winsnap) to the next version of GIMP, would that be ok as well. As an alternative, I could try to minimize the mouse clicks: (1) A key shortcut to File/Acquire/Screen Shot... (2) Default to Grab the whole screen. How? If possible. (3) A periodic script which saves and closes any active images it finds. (Screenshots are named as Untitled-1.0, Untitled-2.0 etc.) BTW, IrfanView has the needed features, but they do not work because probably the capture setup option file is in the protected installation directory, and defaults are capture-and-edit. :-( Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Re: How damaged photos my camera takes?
How would one correct the photos 7748 and 7749 to look like 7741 and 7751? And at the same time preserving the sunrays? http://www.funet.fi/~kouhia/7748.jpg (automatic mode) http://www.funet.fi/~kouhia/7749.jpg (manual mode with less exposure) http://www.funet.fi/~kouhia/7741.jpg (automatic mode) http://www.funet.fi/~kouhia/7751.jpg (automatic mode) Both my attempts uses first the curves tool and then adds saturation, but I have no idea what would be correct/best operations. http://www.funet.fi/~kouhia/7749mod1.png (my attempt 1) http://www.funet.fi/~kouhia/7749mod2.png (my attempt 2) The curve was designed using the rules: (1) The top values, i.e., sky, are ok and thus curve y = x should be applied at top. (2) Exposure time was low at bottom+middle and thus curve y = 3x (for example) should be applied there. The linear function y = 3x means that the exposure time is tripled. (3) Some smooth piece of curve connects the bottom and top segments. In practise, I had to use only 4 control points in the curve because more points meant wavy curve. That limited the smooth piece of curve between the bottom and the top greatly. Better spline would be needed in the curve tool, like what is in the path tool (but note that I have GIMP 1.2.3). Saturation was added until the photo looked ok enough. The saturation worked like a magic. I wonder why it seems to be needed. Is it a camera property that low exposure works differently than long exposure? Or is it property of the curve tool? I.e., a better curve tool would always add the saturation. The image 7749mod2 looks tolerable, but the noise is a big problem. I guess better camera would solve that. I could also try the HDR photo techniques as I found Olli's dynamic range extender. I have a code somewhere which I obtained from a person who wrote similar photo combiner for multiple photos, and wrote a Siggraph paper on it. Though, digital cameras could have a sequencer which can be programmed to take multiple photos as fast as possible with different settings (exposure, focus, zoom, etc). No patent pending. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Re: How damaged photos my camera takes?
From: Mogens Jaeger [EMAIL PROTECTED] ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3922.JPG ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3923.JPG As I see your pictures, your problem is not a question on how to use Gimp, but how to use your camera. [ ... ] What preciesly is it, you can't find out, and wants help for? Here I merely asked help in analyzing the problem. And if the problem can be fixed in post processing. Is the white sky overexposed or is the white point at white instead of blue? Why the trees in 3923 looks pale? Is it because of some kind of overcurving (similar to gamma correction)? They are GIMP related questions. I asked later in gphoto-user about the camera issues. And plan to ask in rec.photo.* newsgroups if the issue is not clear enough after all this. Some weeks ago I had a LEGO photo with default white point, and another photo with teached white point. I tried to come up with formula which makes the change of the white point, but for some reason I failed. So, reverse engineering the camera behaviour by matching the photos 3922 and 3923 may be too difficult problem for me. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Re: How damaged photos my camera takes?
Hello. I took photos with Canon IXUS II + automatic mode: ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3893.JPG ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3896.JPG ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3922.JPG ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3923.JPG Here is my own analysis of my photos above. This is starting to be more a topic of a photo group discussions. I just wanted to know what the post processing people like you think about the photos. It looks like in both photo-pairs the bad photo (3893 and 3922) is overburned. The blue flowers (3893) and the sky (3922) shows white which cannot be fixed. In addition to overburning, the photo 3922 shows some kind of intensity curving. I.e., take the better photo 3923 and try modify it to look like the bad photo 3922 with the curves tool. The curve I had to use was of the damaging type -- overcurving. White-point problem? I don't know how to correctly change the white sky in 3922 to the blue sky like in 3923. The manual mode seems to not be manual at all: In photoing a new tree scene in two parts with the parameters fixed, the photos were exposed differently. The common area in two photos is not the same. It is just like the pair 3922/3923: with overburning. The camera does something automatic in the manual mode. While the exposure setting can be locked for multiple photos and that would have solved the problem, not always I have a blue sky available for reference! The camera should expose all parameters to user, or have a possibility to use existing photo as a reference, or have a preset system for exposure. I hope camera manufacturers start increasing the number of bits in the pixels so that camera could take and view good photos without overburning. They are now marketing more pixels instead of improving the photo quality (lens + exposure). At least people can see the poor photos with a good resolution. Overcurving is mystery to me: the photo 3923 modified with a mild curve looks better than 3922. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] How damaged photos my camera takes?
Hello. I took photos with Canon IXUS II + automatic mode: ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3893.JPG ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3896.JPG ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3922.JPG ftp://ftp.funet.fi/pub/pics/freephotos/juhana/withstand/IMG_3923.JPG There is something wrong with the camera as can be seen from the pairs 3893/3896 and 3922/3923. In photo 3893 the flowers glows and are white, not blue. In photo 3922 the trees looks somehow poor. Between the two versions I only inserted white paper (3896) or tilted the camera toward the blue sky (3923). What is wrong? How to fix the photos? How ever I could make a panorama photo out of 3922 and 3923? How damaged the photos are? In what way(s) the photos are damaged? Should I switch the camera to some other camera? Canon's top model Powershot 3 IS seems to damage the photos too, but I don't know if the camera can be tuned in the automatic mode because I had only brief moment to test the camera. Why Canon thinks it is ok to damage the photos in automatic mode? Very sad, I have taken hundreds of photos for my freephotos project and mostly they look as bad as 3893 and 3922. More mild automatic settings would have allowed me to fix the photos later. Not now. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] How to move the white point?
Hello. How do I move the white point in GIMP? All three photos below were taken with the camera. How could I reproduce the photo 3 from photos 1 and 2 in GIMP? That is, assume I don't have the photo 3 below but I want something close. http://www.funet.fi/~kouhia/whitepoint1.jpg % wrong whitepoint http://www.funet.fi/~kouhia/whitepoint2.jpg % wrong whitepoint, example white http://www.funet.fi/~kouhia/whitepoint3.jpg % whitepoint based on example white Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Re: Livre sur Gimp (aka publishing GIMP books)
From: Michael J. Hammel [EMAIL PROTECTED] FWIW, I'm working on another GIMP book, tentatively titled The Artist's Guide to GIMP Effects. It's essentially a followup to my first book, The Artist's Guide to the GIMP. I think the publication date is early next year - publisher is No Starch Press. Could you all authors limit the copyright to a few years? (Instead of having copyright term 80 years after you drop off.) It should not make harm to the business. Well, the software was given free to you, give us something back. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software ___ Gimp-user mailing list Gimp-user@lists.xcf.berkeley.edu http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
[Gimp-user] Re: [Gimp-developer] Re: Usability test - Results available
From: Carol Spears [EMAIL PROTECTED] gimp has been able to do this since gimp-1.0.2 that i know of. Good. Anyone has used it to make the screenshots? I would like to take a look. Juhana ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
[Gimp-user] Re: Gimp on Slashdot
From: Alan Horkan [EMAIL PROTECTED] Adobe Photoshop allows one to easily draw shapes (such as polygons) that are very difficult to draw using only select+Stroke. Cinepaint has the drawing code. They took the vector drawing plugin and made it work directly within the image. The ex-plugin has a lot of room for improvements, but it is a start of something. How many more of these articles must be written before the Gimp developers accept that simple drawing tools are a must for a certain type of user? But maybe they are not that easy to code? Adding a vector layer to the images should be easy if the image object is good, but the vector manipulations can be difficult. Typically each plugin has its own kludge way to manipulate vector objects (selection tools, crop tool, etc). The selection tool vector drawing and the crop tool vector drawing are not visible in other views of the same image because the framework is kludge. What we need is a good old vertex/edge/polygon framework. We don't have even the simplest systems developed at 1960s. Check out ftp://ftp.funet.fi/pub/sci/audio/devel/constraints/sketchpad.pdf what I mean. I'm figuring out what kind of framework would be ok. Anyone would like to help? Regards, Juhana ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] Processing the scanned textual images?
From: "Michael P. Soulier" [EMAIL PROTECTED] You might then consider ImageMagick. It's intended for this kind of thing, as opposed to a lot of user interaction. I still have to define __interactively__ one rectangle per image. ImageMagick cannot do it. Gimp can do what I want, but I should be able to move the actual performance of operations to the patch processing. In my own Gimp script: -Am I able to make a dialog window with one button: "next image"? -The script is able to close the previous image and open the next image? -While the image is open, am I able to draw a selection rectangle or a crop tool rectangle on the image? -To save the rectangle information to a file (when the "next" button is pressed while the rectangle is still visible)? After all that I would be able to use another script to actually perform the operations. If all above can be performed, I could check that script myself. By the way, it doesn't look good if people are here pointed to use other software; why not ask how Gimp could be improved for making all the above possible? Thanks. Regards, Juhana ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
[Gimp-user] Processing the scanned textual images?
Hello. I would be able to process hundrets of scanned textual images in an user friendly manner: -No open file dialogs; next image button would be fine -I should be able to define a rectangle (for cropping) to each image -Cropping and other operations should then be done off-line (in patch process) The image operations include: cropping, text skew detection, rotation by the skew angle, greyscale balancing over the whole image, greyscale level quantization (to a fewer amount of levels). After all these are done, then each image are padded to the same size. I would appreciate if the amount of user interaction and the waiting times are kept in minimum. I have ideas on this if this requires some script or plug-in development. Best regards, Juhana ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
