Re: [Gimp-user] how to break down a photo into printing colors and newsprint shading
I don't think this is possible. JPEG are already cooked, and flattened picture. I don't think you will be able to break it down, and turn it back to xcf (gimp format). I guess you shouldn't have deleted the original file of the image.ROCK n ROLL REBEL- Original Message From: rob [EMAIL PROTECTED]To: gimp-user@lists.XCF.Berkeley.EDUSent: Monday, November 6, 2006 4:25:48 PMSubject: [Gimp-user] how to break down a photo into printing colors and newsprint shadingIs there a way in GIMP to take any JPG image and have GIMP output4 color seperatedimages as individual CYGK or RGB or choosable colors?I want to make a silk screen with a real complicated color image and I thought it could be possible tobreak down the photo into the silk screen inks and then make 4 different ink screens withemulsifiers by each color of the photo.I find pallettes and tools and such but can not make any sense of how to actually accomplish the task.Also... what about shading.Does gimp do shading...like newprint shading with dot densities?Is there a technical name for this kind of shading where a black and white image can appearas shading by dot saturations and not actually by having shades of grey?I'm real new at this so any information woul dbe greatly appreciated.Rob___Gimp-user mailing listGimp-user@lists.XCF.Berkeley.EDUhttps://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Re: how to break down a photo into printing colors and newsprint shading
Look for the Decompose plugin - ColorsComponentsDecompose... CMYK - you'll get an image with 4 black and white layers. Then you can save each layer as separate files you can use for silk screen. To make shadings with dots, use FilterDistortsNewsprint and play with the settings ;) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user]
3. Is there a way to open more then one picture on the same screen? Because I want to put a few pictures together and then save it as one new picture. you can also drag and drop images into the gimp if you drop it on your toolbox it will open it as a new image and when you drop it on an already opened image it will open it as a new layer -- LEGENY Jozef ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: how to break down a photo into printing colors and newsprint shading
On 11/6/06, graffoo [EMAIL PROTECTED] wrote: Look for the Decompose plugin - ColorsComponentsDecompose... CMYK - you'll get an image with 4 black and white layers. Then you can save each layer as separate files you can use for silk screen. To make shadings with dots, use FilterDistortsNewsprint and play with the settings ;) Is it my imagaination, or are the CMYK layers inverted? I'm using GIMP version 2.2.13 Chris ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: how to break down a photo into printing colors and newsprint shading
On Monday 06 November 2006 09:32 pm, Chris Mohler wrote: On 11/6/06, graffoo [EMAIL PROTECTED] wrote: Look for the Decompose plugin - ColorsComponentsDecompose... CMYK - you'll get an image with 4 black and white layers. Then you can save each layer as separate files you can use for silk screen. To make shadings with dots, use FilterDistortsNewsprint and play with the settings ;) Is it my imagaination, or are the CMYK layers inverted? Yes, for printing purposes they are inverted after the decompose plug-in. The amount of ink is marked in each pixel from 0 to 255 - so, if an image has some pixels with zero yellow (for example, white pixels) - the output of the decompose plug-in has this as zero yellow ink- meaning black. if it where full yellow, it would be full intensity - showing White. In pratice, you just have to invert that. You can't however expect color accuracy with that plug-in. That is - you will have variations on the color you see on the screen and the color you get if you use the decompose plug-in, invert each resulting image, print that as a screen, and recompose the colors. you may also want to increase the pixel quantity in your image, before using the newsprint plug-in. Your target printing process have an ideal lpi number - arrange your work so that you have these lpi in the final image for each color. Another way of doing this work you might find usefull is using the GIMP channels instead of layers for compositing your final image. Just create a channel for each ink color you intend to use, and later apply the newspirint plug-in ont these channels. As for separating, let's say, dark blue in a separate channel from a normal RGB image, I can think of the following procedure, which would have to be written as a plug-in: duplicate image, flatten-image, duplicate layer, color to alpha(remove desired channel color, on the underlying layer), set upper layer to 'difference' combine mode, copy visible, paste as new layer, dessaturate, copy, create new channel, paste on new channel. Perceive taht whatever you do, the dessaturate step will modify the finalc composition of your image you should spend some trial and error either in that step, or modifying the curve of the final channel. Either way, I'd like to hear how you are doing when using GIMP this way. Regards, js -- I'm using GIMP version 2.2.13 Chris ___ ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: how to break down a photo into printing colors and newsprint shading
Either way, I'd like to hear how you are doing when using GIMP this way. To be 100% honest, I still haven't done too may separations with GIMP yet. I'm slowly gathering all the bits and pieces necc. to replace AI and PS with Inkscape and GIMP - but it's taking a while :) I have used spot channels in GIMP, and they behave as expected. The 'halftone/newsprint' plugin seems a tad noisy to me, so for haltones I'm saving as PS, inserting my haltone freq/angle into the PS file, and printing through ghostscript. (it here a way to use GS as a plugin for GIMP...?wheels turning) It's a work in progress - I'll let everyone know how I make out... Chris ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] thanks and what format is best to start with when doing seperations
Thanks for the newsprint and color seperation instructions. I was certain these were possible but could not find detailed instructions. I have not tried anything yet but will get on it now an dhave some tests in this hour. I was very disappointed to get this first response: I don't think this is possible. JPEG are already cooked, and flattened picture. I don't think you will be able to break it down, and turn it back to xcf (gimp format). I guess you shouldn't have deleted the original file of the image. BUT then the real answers came flying in. I said JPG at first but I don't care if I start with a JPG or BMP or GIF. I figure any image I can scan on the flatbed scanner can be a target to work with. Which brings out the question of WHAT FORMAT would be the best to start in when knoing that the whole seperation process will be done with an image. Is there any reason to select any one format over another considering that most shared images do show up as GIF and JPG.?!?!?! ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] how to break down a photo into printing colors and newsprint shading
- Original Message From: rob [EMAIL PROTECTED]To: gimp-user@lists.XCF.Berkeley.EDUSent: Monday, November 6, 2006 4:25:48 PM Subject: [Gimp-user] how to break down a photo into printing colors and newsprint shadingIs there a way in GIMP to take any JPG image and have GIMP output4 color seperatedimages as individual CYGK or RGB or choosable colors? I'm not sure I understand what you're after but take a look at Image-Mode-Decompose -- Tim Jedlicka, Network Entomologist [EMAIL PROTECTED], http://www.galifree.com ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] after DECOMPOSE to CMYK then what
I got as far as IMAGE MODE DECOMPOSE and that produces the desired black and white images in greyscale 4 layers and if I do a page up or down I get black,yellow_k,magenta_k,cyan_k on the image box at the bottom of the image BUT then what? I seem to be missing the one magic step that breaks these 4 layers in seperate images. What action do I need to make the 4 seperated images to save out to the hard disk? ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] how to break down a photo into printing colors and newsprint shading
Hi Rob, On 11/7/06, [EMAIL PROTECTED] Message: 4 Date: Mon, 06 Nov 2006 03:25:48 -0500 Subject: [Gimp-user] how to break down a photo into printing colors and newsprint shading Message-ID: [EMAIL PROTECTED] Is there a way in GIMP to take any JPG image and have GIMP output 4 color seperated images as individual CYGK or RGB or choosable colors? I want to make a silk screen with a real complicated color image and I thought it could be possible to break down the photo into the silk screen inks and then make 4 different ink screens with emulsifiers by each color of the photo. I find pallettes and tools and such but can not make any sense of how to actually accomplish the task. Also... what about shading. Does gimp do shading...like newprint shading with dot densities? Is there a technical name for this kind of shading where a black and white image can appear as shading by dot saturations and not actually by having shades of grey? I'm real new at this so any information woul dbe greatly appreciated. I think there is a CMYK plugin for GIMP. May be that's what you need. May be Filter/Distord/Newsprint is what you need for newsprint shading. -- Asif ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] save 4 layers as 4 seperate mages ....I am stumped
Interesting...newsprint filter does make the dots resolutions. OK Looks like all the pieces are here except for. I still have not figured out how to save out ONE layer at a time while in the CYMK.jpg 4 layers greyscale image. Can anyone give me the instruction to accomplish this one simple task? I'm stumped. I can't find any way to isolate single layers and each layer is the individual seperated colors I desired to work with. Such a tease. So close but still no cigars. Asif Lodhi wrote: Hi Rob, On 11/7/06, [EMAIL PROTECTED] Message: 4 Date: Mon, 06 Nov 2006 03:25:48 -0500 Subject: [Gimp-user] how to break down a photo into printing colors andnewsprint shading Message-ID: [EMAIL PROTECTED] Is there a way in GIMP to take any JPG image and have GIMP output 4 color seperated images as individual CYGK or RGB or choosable colors? I want to make a silk screen with a real complicated color image and I thought it could be possible to break down the photo into the silk screen inks and then make 4 different ink screens with emulsifiers by each color of the photo. I find pallettes and tools and such but can not make any sense of how to actually accomplish the task. Also... what about shading. Does gimp do shading...like newprint shading with dot densities? Is there a technical name for this kind of shading where a black and white image can appear as shading by dot saturations and not actually by having shades of grey? I'm real new at this so any information woul dbe greatly appreciated. I think there is a CMYK plugin for GIMP. May be that's what you need. May be Filter/Distord/Newsprint is what you need for newsprint shading. -- Asif ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] save 4 layers as 4 seperate mages ....I am stumped
On 11/6/06, rob [EMAIL PROTECTED] wrote: Interesting...newsprint filter does make the dots resolutions. OK Looks like all the pieces are here except for. I still have not figured out how to save out ONE layer at a time while in the CYMK.jpg 4 layers greyscale image. Can anyone give me the instruction to accomplish this one simple task? I'm stumped. I can't find any way to isolate single layers and each layer is the individual seperated colors I desired to work with. Such a tease. So close but still no cigars. Hide all unwanted layers, then do file save as. If you choose PNG for exmaple, GIMP will merge the visible layers and save a copy. Repeat for each layer. Chris ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] saves out visible great.. automation
Ok...very good.. the desired result. I didn't know that the SAVE AS would only save the visible PNG image and not the underlying bag of tricks. OK... so looks good...got the desired effect color seperation and also how to make newsprint shading. So how about automaticly doing this process? Can I make a script process that starts out with a JPG ..or GIF..or whatever is best..I didnt' get any advice on that... AND THEN IMAGE -MODE-DECOMPOSE into CYMK format then display only each individual color and save out an image in PNG or whatever is best.. then when all 4 colors are done... individually do FILTER-DISTORT-NEWSPRINT to 4 more images Is there an example of how to do this kind of scripting? ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
