Re: [Gimp-user] how to invert greyscale values only...

2010-02-05 Thread yahvuu
Rich Evans wrote: That's it! Perfect. glad to hear it works as expected. Just want to add that the programmer's route, aka doing it by the math, is quite viable, too. Some selected options: - the MathMap plugin probably enables the most concise solution:

Re: [Gimp-user] how to invert greyscale values only...

2010-02-04 Thread Cédric Gémy
Duplicate layer, invert bottom layer and cut all blacks and whites out of (transparent) top layer (of course, if there's a range of greys it gets more complicated). it's evident that this is the problem : i don't know about Rich's photo but the sample i use here have various flavors of blacks'.

Re: [Gimp-user] how to invert greyscale values only...

2010-02-04 Thread yahvuu
hi, Rich Evans wrote: [..] Is there a technique or tool to invert any part of the image that is only a shade of grey? i.e. invert pixeils with a saturation of ~0 (if that is how you say it). The on-board tools are just fine for this. Do something to some pixels (here: invert) and leave

Re: [Gimp-user] how to invert greyscale values only...

2010-02-04 Thread Rich Evans
Message From: yahvuu yah...@gmail.com To: Rich Evans reva...@yahoo.com Cc: Gimp-user@lists.XCF.Berkeley.EDU Sent: Thu, February 4, 2010 4:31:19 AM Subject: Re: [Gimp-user] how to invert greyscale values only... hi, Rich Evans wrote: [..] Is there a technique or tool to invert any part

Re: [Gimp-user] how to invert greyscale values only...

2010-02-03 Thread Rich Evans
of tool/script exist? continued thanks, -rich - Original Message From: Ken Warner kwarner...@verizon.net To: Rich Evans reva...@yahoo.com Cc: Gimp-user@lists.XCF.Berkeley.EDU Sent: Tue, February 2, 2010 8:12:09 PM Subject: Re: [Gimp-user] how to invert greyscale values only... Colors

Re: [Gimp-user] how to invert greyscale values only...

2010-02-03 Thread Andrew
: Re: [Gimp-user] how to invert greyscale values only... not completely satisfied with sven's method, working on some pictures but not any, depending on the shades. I used to do it in CMYK a long time ago with photoshop by just pushing the image to CMYK and inverting the K curve. I guess

Re: [Gimp-user] how to invert greyscale values only... leaving colors alone

2010-02-02 Thread Sven Neumann
On Mon, 2010-02-01 at 15:27 -0800, Rich Evans wrote: Hello, Is this the right place to ask a question about special filters in GIMP? If so, I'd love some advice on the following task: I have an RGB image that is basically a black background with many colorful objects and white text. ---

Re: [Gimp-user] how to invert greyscale values only...

2010-02-02 Thread Cédric Gémy
not completely satisfied with sven's method, working on some pictures but not any, depending on the shades. I used to do it in CMYK a long time ago with photoshop by just pushing the image to CMYK and inverting the K curve. I guess something might be done with decompose color filter or so. But the

Re: [Gimp-user] how to invert greyscale values only...

2010-02-02 Thread Rich Evans
anyone consider this... easy? continue thanks, -Rich - Original Message From: Cédric Gémy radar.ma...@free.fr To: Gimp-user@lists.XCF.Berkeley.EDU Sent: Tue, February 2, 2010 5:58:51 PM Subject: Re: [Gimp-user] how to invert greyscale values only... not completely satisfied with sven's

Re: [Gimp-user] how to invert greyscale values only...

2010-02-02 Thread Ken Warner
-user] how to invert greyscale values only... not completely satisfied with sven's method, working on some pictures but not any, depending on the shades. I used to do it in CMYK a long time ago with photoshop by just pushing the image to CMYK and inverting the K curve. I guess something might

Re: [Gimp-user] how to invert greyscale values only...

2010-02-02 Thread Owen
: [Gimp-user] how to invert greyscale values only... not completely satisfied with sven's method, working on some pictures but not any, depending on the shades. I used to do it in CMYK a long time ago with photoshop by just pushing the image to CMYK and inverting the K curve. I guess

[Gimp-user] how to invert greyscale values only... leaving colors alone

2010-02-01 Thread Rich Evans
Hello, Is this the right place to ask a question about special filters in GIMP? If so, I'd love some advice on the following task: I have an RGB image that is basically a black background with many colorful objects and white text. --- I'd like to invert the image so that it is a white

Re: [Gimp-user] how to invert greyscale values only... leaving colors alone

2010-02-01 Thread Noel Stoutenburg
Rich Evans wrote: I have an RGB image that is basically a black background with many colorful objects and white text. --- I'd like to invert the image so that it is a white background with black text but a simple invert inverts the colors in all the colored objects as well. Is there a