Re: [Gimp-user] GIMP's equivalent of adjustment Layer in PS?
On 1/9/07, Shawn Willden [EMAIL PROTECTED] wrote: On Monday 08 January 2007 23:10, Steven Woody wrote: in Photoshop, there is a tool 'adjustment layer', what's the equivalent in Gimp? thanks. GIMP doesn't have any equivalent. I believe it's in the plan for future releases. I know the new graphics engine will make adjustment layers very simple to implement, so I wouldn't expect to see them implemented before the new engine goes in, and I would expect them to be implemented very soon after. For now, you just have to make the adjustments directly on your image layer. I usually copy the image layer before applying an adjustment to it, in case I decide to remove the adjustment. Shawn ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user thanks for all the information, but i still expect the adjustment layer to be available in the future releases. anyway, adjustment layer is not wholly in function equal to duplicate a layer. - woody -- woody then sun rose thinly from the sea and the old man could see the other boats, low on the water and well in toward the shore, spread out across the current. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] GIMP's equivalent of adjustment Layer in PS?
in Photoshop, there is a tool 'adjustment layer', what's the equivalent in Gimp? thanks. -- woody then sun rose thinly from the sea and the old man could see the other boats, low on the water and well in toward the shore, spread out across the current. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] auto-level algorithm
can anyone here know how the auto-level does the job? what's the algorithm it uses? i manually set r/g/b level individually but always failed to get similar result as auto-level yields. thanks. -- Celine: Yes, of course! Now that makes total sense, right? You're a Capricorn, I'm a Sagittarius, that's why we get along so well! ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: Fwd: [Gimp-user] Re: [magick-users] flatten not work
On 4/23/06, Stephan Hegel [EMAIL PROTECTED] wrote: Hi, As Sven mentioned there a couple of those scripts on the web: shell scripts with embedded script-fu, pure script-fu, etc. Which one are you using ? If you use that one posted to http://www.gimptalk.com/forum/topic/Gimp-Xcf-Image-Viewer-2399-1.html thanks, but the link seems not accessable from here. the core statement in my xcf2png is below: ( file-png-save 1 image drawable pngfile pngfile 0 9 0 0 0 0 0 ) so, to replace the above statement i think i have to unstand it first. it seems easy to guess that 'file-png-save' is a function and from the context i can guess the number '9' is the compression level. to replace it, i think i need a function like file-tif-save or file-tiff-save. is there such a function? if so, what parameters i have to provide to it? before knowing of these information i think i can do nothing on it. thanks! near the bottom of the page it should be obvious where to replace png with tif. Regards, Stephan. steven woody wrote: thank you. i have found the xcf2png and it works. the only question is how about if i want a xcf2tif? i think tiff is better than png, am i right? but since i don't familar with any of GIMP's script-Fu, i don't know how to modify the xcf2png. On 4/22/06, Sven Neumann [EMAIL PROTECTED] wrote: Hi, steven woody [EMAIL PROTECTED] writes: :-( the same doesn't work for me. and, the 'display' can only display one layer of the image too. what's the cause ? the original three layers in the image was got from the 'decomposite' command of GIMP. ImageMagick simply doesn't implement all features of XCF since XCF is the native file format of GIMP and only GIMP supports it completely. If you want to flatten an XCF image or convert it to a different format, use GIMP for it. If you need to do this from the command-line, there are a couple of XCF to PNG converter scripts using the GIMP batch mode. Try to google for xcf2png. Sven -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Fwd: [Gimp-user] Re: [magick-users] flatten not work
thank you. i have found the xcf2png and it works. the only question is how about if i want a xcf2tif? i think tiff is better than png, am i right? but since i don't familar with any of GIMP's script-Fu, i don't know how to modify the xcf2png. On 4/22/06, Sven Neumann [EMAIL PROTECTED] wrote: Hi, steven woody [EMAIL PROTECTED] writes: :-( the same doesn't work for me. and, the 'display' can only display one layer of the image too. what's the cause ? the original three layers in the image was got from the 'decomposite' command of GIMP. ImageMagick simply doesn't implement all features of XCF since XCF is the native file format of GIMP and only GIMP supports it completely. If you want to flatten an XCF image or convert it to a different format, use GIMP for it. If you need to do this from the command-line, there are a couple of XCF to PNG converter scripts using the GIMP batch mode. Try to google for xcf2png. Sven -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] the order of downscaling in a image editing workflow.
On 4/13/06, Stephen Norris [EMAIL PROTECTED] wrote: On Thu, 2006-04-13 at 13:45 +0800, steven woody wrote: hi, i usually need different size of image for different situations ( web publish, sharing with friends, etc. ). so it seems practical to complete all editing on the image before do the downscaling. quite often, i will use a utility such as ImageMagic's convert to do the downscaling and converting to other suitable formats. but, gimp's tutorial suggests that one should do some editing tasks ( such as sharping ) after downscaling ( or upscaling ). i want to know why and how do you do that ? what i expected workflow of image editing is: 1) improve contrast and color balance in gimp 2) despeckle 3) sharping 4) add frame/border 5) downscaling to various of sizes and convert to other formats using a script-able tool. thanks. Sharpening after downsampling is normal - the downsampling operation makes the image more fuzzy as a natural consequence, so you generally have to sharpen afterwards. ok. then how about despeckle? can i do despeckle before Since you need to do that, there's no point sharpening beforehand as well. i need sharpening beforehand is because the image is scanned out from film scanner, the result is a little soft comparing to original. Stephen -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] darkening a grey-scale drawing
hi, i found any downsampling ( scale image to a smaller size ) will definitely blur the image ( scaned from film ) to an undesired degree. is there any suggestion around that? using a unsharp-mask after every downsampling ? thanks. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] How to prevent downsampling from bluring my image
hi, i found any downsampling ( scale image to a smaller size ) will definitely blur the image ( scaned from film ) to an undesired degree. is there any suggestion around that? using a unsharp-mask after every downsampling ? -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] How to prevent downsampling from bluring my image
On 4/12/06, Leeuw van der, Tim [EMAIL PROTECTED] wrote: Hiya, What kind of interpolation do you use when rescaling the image to a smaller size? (And what version of GIMP do you use?) i was using Linera interpolation. GIMP version seems 2.2.x on Linux GIMP 2.3.x added a new kind of interpolation, Lanczos I believe it's called, which is said to work better; both for upscaling and downscaling. Binaries of GIMP 2.3.7 are available for windows, but if you don't use windows, then I don't know how you would best get binaries for your platform. i think i can download source tarball and do a compile/install, right? Cheers, --Tim -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of steven woody Sent: woensdag 12 april 2006 10:00 To: gimp-user@lists.xcf.berkeley.edu Subject: [Gimp-user] How to prevent downsampling from bluring my image hi, i found any downsampling ( scale image to a smaller size ) will definitely blur the image ( scaned from film ) to an undesired degree. is there any suggestion around that? using a unsharp-mask after every downsampling ? -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] How to prevent downsampling from bluring my image
On 4/12/06, Leeuw van der, Tim [EMAIL PROTECTED] wrote: Hi Steven, Sorry that my reply is getting a bit messy but outlook on windows isn't very well in quoting text... never mind and i thank you! To get the latest version depends on your distribution. You can get the source tarball and compile, fetching any updated dependancies yourself. But a distribution like Debian is likely to have packages already built and available as part of 'unstable'. ok, i know how to do you. Btw, since your images are scanned from film, perhaps they are already somewhat noisy? yes, i found scanned images are usually noisy than digitial camera's. it is actually a pain for me. what's the best way of handling the case? Did you try to reduce noise, or perhaps increase sharpness / reduce blur / etc, before scaling the image? Just a thought - but it seems to me that (down)scaling a noisy image will give worse results than downscaling a cleaner image. i do the noise reducing using despeckle filter. but it was adviced in many other articles that tools like despeckle will also introduce blurring ( i found it's really true ) and should be down in the very final step, especially after downscaling or upscaling. so, i think i have some problem to get your point here. did you really suggest i do the despeckle or some unsharp mask things before downscaling ? Another option would be to try scaling the images with imagemagick. It might already have lanczos scaling and other scaling options built-in with the version installed (or installable as pre-built package) with your distribution. You can even write a small shell-script to scale all images in some directory, if that's your thing. supposing my Gimp has already equiped a Lanczos interpolation, when comparing to imagemagic in scaling, which one performs better in term of quality? thanks. -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] How to prevent downsampling from bluring my image
ok. thank you for your information and i will try it. On 4/12/06, Leeuw van der, Tim [EMAIL PROTECTED] wrote: Hi Steven, I'm by no means an expert on image manipulation. If experts recommend to do despeckle as last step, then perhaps that might be best. My logic was that a noisy image would be harder to scale right because the noise could introduce more artifacts. But I could be wrong -- I don't have that much experience, and don't have time now to do the experiments. (Would first need to search for a suitable photo...). However, I thought that if you already have a number of photos at hand to experiment with, then it might be a quick experiment for you to first reduce noise in the image, then perhaps sharpen it, and then scale it. About quality of ImageMagik vs. GIMP, I have no idea. I never made a detailed comparison of the two in quality of scaled image. I did make a comparison of scaling of ImageMagik and PIL (Python Imaging Library) and found them to be comparable for the photos I needed to rescale at that point; after which I wrote my script in Python using PIL to scale down (without any further enhancements) a full copy of all images from my digital camera to fit my screen. But, as I said, they're images from a digital camera and not from a scanner. And I didn't care if a single image would come out with poor quality; it was a massive batch operation. At that point I had already given up on writing a GIMP script to perform this operation in batch so I didn't compare the quality of GIMP scaling with the others. Cheers, --Tim -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] the order of downscaling in a image editing workflow.
hi, i usually need different size of image for different situations ( web publish, sharing with friends, etc. ). so it seems practical to complete all editing on the image before do the downscaling. quite often, i will use a utility such as ImageMagic's convert to do the downscaling and converting to other suitable formats. but, gimp's tutorial suggests that one should do some editing tasks ( such as sharping ) after downscaling ( or upscaling ). i want to know why and how do you do that ? what i expected workflow of image editing is: 1) improve contrast and color balance in gimp 2) despeckle 3) sharping 4) add frame/border 5) downscaling to various of sizes and convert to other formats using a script-able tool. thanks. -- woody ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: retouching dark photos
michael chang [EMAIL PROTECTED] writes: On 8/6/05, Steven Woody [EMAIL PROTECTED] wrote: Pasi Savolainen [EMAIL PROTECTED] writes: more interesting, in the levels window, if i pick a point p1 as grey using grey picker, then pick another point p2 as another grey point. in this case, what gimp will do? i think there are two candidates, 1, do adjust to make p1 grey, and from that point on do another adjust to make p2 grey. the result will be: p1 and p2 are both natural grey. 2, as if user did not click p1, gimp adjust p2 from scratch and simply forgot what he did before. I believe it's case two, but I'm not sure. That's what my experience has shown me. Otherwise, I'd imagine it was a bit odd. Let's say P1 was 0,0,0 (black), and P2 was 255,255,255 (white)? I don't think case 1 would even be possible. I could be wrong though. in your case, i think, there is no adjusting is needed since r=g=b for both points. -- ~Mike - Just my two cents - No man is an island, and no man is unable. -- steven woody (id: narke) As boys, they said they would die for each other. As men, they did. - Once Upon a Time in America (1984) ___ Gimp-user mailing list Gimp-user@lists.xcf.berkeley.edu http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: retouching dark photos
Pasi Savolainen [EMAIL PROTECTED] writes: * Steven Woody [EMAIL PROTECTED]: Pasi Savolainen [EMAIL PROTECTED] writes: * Steven Woody [EMAIL PROTECTED]: See also: http://gimp-savvy.com/BOOK/index.html?node60.html when playing with level or curves, did you guys adjust each channel alone or the overall combined value? I often take them by channel. It really depends on how well your source adjust image per-channel. My digicam, being pre-2000, tends to make blue channel too weak, so it's 'white' point is much lower than redblue. I can't really tell if operating on 'grand total' would produce same result, it is a matter of convenience of knowing what is happening that I'm after. when i worked on individul channels, i always got color cast. i just can not image that how people working on channels can still keep color balance well sicne you can not do the r,g,b simultanously. any tips there? This depends heavily on the image that's worked on. Generally I'd say procedure is to go through r,g,b and adjust only black and white point, leaving gamma (middle number) as it is. Most images have about linear channels, only shifted+compressed in some way, so this will get you mostly castless image (again, this is very taste-specific operation and some people, of which I may be one, just don't see much difference in some shades). When image has cast that I notice, I start working with gamma sliders and try to achieve something that look a bit like the anticolor of the cast. For example if cast is blue, go to blue color and move gamma to the right, making it smaller (the colorstrip will turn yellow). In case of yellow cast one would move it to the left. etc. Often after one cast is removed, another creeps up, so this is a game of balance. Turning preview on/off helps a lot, as does having a Image-Duplicate around at all times. i think you were talking about level tool, did you mean you will not prefer curve tool? Using color pickers and choosing black/grey/white colors from _really_ black grey and white spots will likely get you into a good start. They just tend to clip whites/blacks too much, losing detail that way. okay, i got your point about using the black/white point in the picture to set the relative ends of level tool. but how you use grey? -- Psi -- http://www.iki.fi/pasi.savolainen ___ Gimp-user mailing list Gimp-user@lists.xcf.berkeley.edu http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user -- steven woody (id: narke) Virginia Woolf: You cannot find peace by avoiding life, Leonard. - The Hours (2002) ___ Gimp-user mailing list Gimp-user@lists.xcf.berkeley.edu http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: retouching dark photos
Sven Neumann [EMAIL PROTECTED] writes: Hi, Steven Woody [EMAIL PROTECTED] writes: okay, i got your point about using the black/white point in the picture to set the relative ends of level tool. but how you use grey? The grey color picker helps you to remove color casts from your image. Pick from a spot that is supposed to have a neutral color. It doesn't have to be 50% gray, but it should be some level of gray. This will adjust the gamma values of the individual color channels in a way that will correct for the color cast. Sven thank you, i forgot there is a grey picker. BTW, i want to know when you do all of these, are you in 'value' channel or in r/g/b channel respectively? -- steven woody (id: narke) ___ Gimp-user mailing list Gimp-user@lists.xcf.berkeley.edu http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] retouching dark photos
Raphaël Quinet [EMAIL PROTECTED] writes: On Fri, 05 Aug 2005 13:16:28 -0400, Roger D Vargas [EMAIL PROTECTED] wrote: First of all, Im a total newbie in image management. I have made just some simple things with Gimp. I have some pictures I took with low lights, and I would like to know the correct method to improve it. Right now Im using Brigth and contrast to increase bright. There is no single method that works perfectly in all cases, but you can try Image-Layers-Colors-Levels or ...-Curves. In the Levels dialog, try moving the left handle (the black one) to the right. Try moving the middle one as well. The preview will allow you to see what happens and should help you to find the best values for correcting your pictures. The Auto button can give interesting results, but can also introduce color casts so maybe you should experiment first with manual adjustments. See also: http://gimp-savvy.com/BOOK/index.html?node60.html when playing with level or curves, did you guys adjust each channel alone or the overall combined value? -Raphaël ___ Gimp-user mailing list Gimp-user@lists.xcf.berkeley.edu http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user -- steven woody (id: narke) Kiss me. Kiss me as if it were the last time. - Casablanca (1942) ___ Gimp-user mailing list Gimp-user@lists.xcf.berkeley.edu http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: retouching dark photos
Pasi Savolainen [EMAIL PROTECTED] writes: * Steven Woody [EMAIL PROTECTED]: See also: http://gimp-savvy.com/BOOK/index.html?node60.html when playing with level or curves, did you guys adjust each channel alone or the overall combined value? I often take them by channel. It really depends on how well your source adjust image per-channel. My digicam, being pre-2000, tends to make blue channel too weak, so it's 'white' point is much lower than redblue. I can't really tell if operating on 'grand total' would produce same result, it is a matter of convenience of knowing what is happening that I'm after. when i worked on individul channels, i always got color cast. i just can not image that how people working on channels can still keep color balance well sicne you can not do the r,g,b simultanously. any tips there? -- steven woody (id: narke) Stills Photographer: You know double-O-7? Bob: He drinks martinis, but all right. - Lost in Translation (2003) ___ Gimp-user mailing list Gimp-user@lists.xcf.berkeley.edu http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
