[Gimp-user] Please enlighten me!
Hello Gimp Wizards, This is my first post to this eminent forum. I'm a technical journalist working on a series of articles on freeware image editing software, for the Swedish monthly photo magazine FOTO. Gimp seems to be the 'pièce de résistance' of free image manipulation programs and I'm already impressed by its capabilities. However, being raised on Photoshop but a newbie with Gimp, I'm stumped by some of Gimp's functions. Please bear with me... 1) I can't seem to find any option for a continuous numerical readout of RGB and greyscale values as I move the cursor in the image! I have discovered that I can use the Color Picker tool to get readouts if I click somewhere. BUT, if I invoke a function like Color Correction, the Color Picker window is disabled and no help at all for checking stuff like clipping channels or colour casts of areas that should be neutral. From Photoshop I'm used to always having readouts available in the Info palette. In Gimp, it seems that though I get all kinds of positional data in the lower left image frame corner, there's no color data readout option. 2) The Decompose to... and Compose to... functions are intriguing and potentially useful, BUT so far, I haven't been able to, say, Decompose an RGB image to LAB (for sharpening just the L channel or for adjusting gamma without colour saturation buildup) AND then Compose the layered image back to RGB! When I try, I get truly weird colours and I get the impression that Decompose to... and Compose to... don't work in a complementary or transparent manner. This makes me wonder what these functions are meant for. So, again, there might be something I'm just missing, being weaned on Photoshop, and if anybody could set me on the right track, I'd be most grateful. Best regards, Joachim ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Re: Please enlighten me!
Joachim Smith wrote: Hello Gimp Wizards, I am not a gimp wizard, just a user, so forgive me if I cannot answer all of your questions. I use gimp 2.3.7 so there might be a few differences between my answers and what you actually have in your version. [...] However, being raised on Photoshop but a newbie with Gimp, I'm stumped by some of Gimp's functions. Please bear with me... 1) I can't seem to find any option for a continuous numerical readout of RGB and greyscale values as I move the cursor in the image! The colour picker tool is the one you want. It is the 8th in the toolbox. When you select it, notice the tool options tab in the bottom half of the toolbox window. There you can see an option check-box Use info window (Shift). If you check it or if you press shift while clicking on the image with this tool, a window will pop up and tell you what you want. I have discovered that I can use the Color Picker tool to get readouts if I click somewhere. BUT, if I invoke a function like Color Correction, the Color Picker window is disabled and no help at all for checking stuff like clipping channels or colour casts of areas that should be neutral. The colour picker can be used from within the main colour correction tools (Curves and Levels). Try clicking on the images when you use the curve tool, it will put a point at the corresponding coordinate. In the Levels tool, there are some colour picker icons to set the black, white and grey points. From Photoshop I'm used to always having readouts available in the Info palette. In Gimp, it seems that though I get all kinds of positional data in the lower left image frame corner, there's no color data readout option. 2) The Decompose to... and Compose to... functions are intriguing and potentially useful, BUT so far, I haven't been able to, say, Decompose an RGB image to LAB (for sharpening just the L channel or for adjusting gamma without colour saturation buildup) AND then Compose the layered image back to RGB! When I try, I get truly weird colours and I get the impression that Decompose to... and Compose to... don't work in a complementary or transparent manner. This makes me wonder what these functions are meant for. Ouch! L A and B channels. At least the gimp should be corrected to spell this correctly ;) (as everyone knows, L*, a* and b*) I cannot help you on that one, since my compose plugin just crashed when I selected LAB in it... Good reason not to use unstable versions ;) Wait... well, I can use Recompose and it works fine. Did you assigned the right channels or images to the L* a* and b* components in the compose windows ? Are you sure you chose LAB and not RGB when recomposing ? So, again, there might be something I'm just missing, being weaned on Photoshop, and if anybody could set me on the right track, I'd be most grateful. Best regards, Joachim Best regards, Olivier. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Please enlighten me!
Hi, Joachim Smith [EMAIL PROTECTED] writes: From Photoshop I'm used to always having readouts available in the Info palette. In Gimp, it seems that though I get all kinds of positional data in the lower left image frame corner, there's no color data readout option. GIMP has an Info window that offers exactly this functionality. Sven ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] bw to btransparent
I have an image that is 2 colors, black and white. I want to change all the white pixel to transparent. How do I do this? ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] bw to btransparent
mickeydog wrote: I have an image that is 2 colors, black and white. I want to change all the white pixel to transparent. How do I do this? Add an alpha channel to the image (if not possible, change image mode from indexed to RGB first) Select by Color (selecting white) Ctrl-K to clear the selection Save in a format that supports transparency (i.e. NOT jpg) Andreas ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] bw to btransparent
On 3/29/06, mickeydog [EMAIL PROTECTED] wrote: I have an image that is 2 colors, black and white. I want to change all the white pixel to transparent. How do I do this? Filters - Colors - Color to Alpha HTH, Mati ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] bw to btransparent
Hi, I would copy the layer, paste it into a layer mask (add layer mask-from selection), and invert the mask. Cheers, Dave. mickeydog wrote: I have an image that is 2 colors, black and white. I want to change all the white pixel to transparent. How do I do this? ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user -- David Neary [EMAIL PROTECTED] ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
