Four color theorem

Does anyone know where I can find a source code for the four color theorem? Finding anything on the web is difficult, and I want to show my CMSI class to see how it properly looks like. I'd program it myself, but I have too many things to do - another job, cooking, etc. I really need help, here. Please post the link or cut and paste the code. Thanks.

Does anyone know where I can find a source code for
the four color theorem? Finding anything on the web is
difficult, and I want to show my CMSI class to see how
it properly looks like. I'd program it myself, but I
have too many things to do - another job, cooking,
etc. I really need help, here. Please post the link or
cut and paste the code. Thanks.How about I write the code and come to your class and do a presentation for you. Come on,
cough troll.

Similar Messages

Graph List Coloring

Hi
please can someone help me for this algorithm.
The problem is the classic graph coloring with the condition: two adjacent nodes do not have the same color and any vertix has a list of admitted colors.
thanks a lot

Hi
please can someone help me for this algorithm.
The problem is the classic graph coloring with the
condition: two adjacent nodes do not have the same
color and any vertix has a list of admitted colors.
thanks a lotThis is related to the map colouring problem. If you draw
a link between the capital cities of each pair of countries
with a common border, you get a graph. Conversely the graph
gives rise to a map.
Therefore, the literature on map colouring could be helpful.
The fact that each vertex has a list of admissible colours is
a complication that could prevent any solution from existing.
For example, if two vertices have only one admissible colour,
the same for each, then it can't be done. The famous four
colour theorem, first proved by Appel and Haaken in the 1970s
(using a computer intensive proof) shows that a colouring is
always possible if all vertices have the same list of four
colours, but it was known long before that if there are only
three colours, there are maps that can't be coloured.
Obviously, an exhaustive search would work in theory, but it
would at least be an exponential time algorithm.
Start with one colour for any vertex and choose a different
colour for each adjacent vertex. Then do the same for each of
the newly coloured vertices, skipping those that have already
been coloured. Keep going until a vertex can't be coloured or
the whole graph has been coloured.
Each time you get stuck, backtrack and change a colour until
you've tried every colour on each list, or you find a colouring.
Hopefully there's a more efficient algorithm in the literature.

OSX Print in Black and White on an HP Color printer?

I have an HP8500 Color printer connected to OSX 10.8.3 through a JetDirect port. The OSX Driver for the HP8500 does not have the option to print in color or B&W that the windows driver has. As a consequence, even when printing in B&W from a PPT deck, the driver prints using all four color toners to produce a black and white output that looks like it has a hint of purple in it. Is there a different driver I could use that has the option to select black or color output? As it is I'm buring through very expensive color toner for balck and white docs.

The Officejet Pro 8100 ePrinter has the same print mechanism as its All-in-One counterpart the Officejet Pro 8600. This printer has a printhead mechanism that contains 4 individual cartridges: CMYK (cyan/magenta/yellow/black).
One will have to replace the cartridge, if the unit provides a message of one of the colors being empty, before the unit will resume printing. It is a maintenance mechanism to prevent the product from self-damage. Hope this helps.
-------------How do I give Kudos? | How do I mark a post as Solved? --------------------------------------------------------
I am not an HP employee.

Converting CYMK to spot color?

Alright, i just read the 'how to get help quickly', and will attempt to not let my panic show through too much:
I designed graphics to go into my college's literary magazine. I used only two colors: brown and green (8dc63f and 603913). However, last week he informed us (the magazine production people) that RGB wasn't acceptable, since he was going to print in something called 'spot color'. Never heard of it before, but after reasearching, I think I have a vague grasp on it: basically instead of CYMK printing process, he's just going to have two plates, one with each color, and stamp them on the pages (like screen printing). That's fine, but I don't understand how it relates to my files. So we sent the psd files to the printer's "photoshop specialist" and then yesterday I was informed that there was no way to seperate the colors into pantone plates, and that either the book was now going to be blank (thankfully the cover is going to be printed seperately in CYMK so that's fine), or we could use clipart (!!thanks for discrediting a semester of my work), or I could learn to use illustrator and redesign the whole book by monday.
I panic, obviuosly, because after downloading the trial version of illustrator I realized that it's actually nothing like working in photoshop (where's my tablet sensitivity? this is NOTHING like 'illustrating'), and at the end of last night's terror, this is all i could produce: http://img576.imageshack.us/img576/2993/illustrator.jpg
Now for reference, the image I originally made in photoshop looks like this (when placed on a brown background to simulate paper): http://img829.imageshack.us/img829/7015/photoshopf.jpg
I am very confused, because I don't understand why the printing company can seperate the illustrator file into two color plates, but not the photoshop file. Both use the same colors (Pantone 375 and Pantone 161 C, I've learned). I have no clue how to save ANYTHING in 'spot format', the only difference between photoshop and illustrator is that I can click on the pantone swatch in illustrator.
Obviously I'm ignorant and confused, and I appologise for that, since it only makes this situation worse (who knows if I'm using the right terminology).
tl;dr:
I have a whole bunch of psd files that need to be converted to something called 'spot color format'
the images are graphics to be placed in an indesign file, not to be printed on their own, so really, they have to be in the spot color format.
Is there any way in reality to maintain the quality of these images and convert them into 'spot color format'?
I'm still trying to understand illustrator (I'm really a painter, not a designer -- wtf is a vector), but would love to convert the psd files I already have into something usable. the printer people didn't know how, I don't know how (or even understand the issue), but maybe you will?

I tried this with the image you posted, so I can describe in detail the steps.
From the image menu choose Duplicate to keep the original for reference.
From the Image menu choose Mode > CMYK Color.
In the Channels palette, delete (by dragging to the trash there) all channels except the Yellow and Black channels.
Double click the icon of the Black channel and in the window that opens click on the color swatch, then in the next window that opens click the Color Libraries button, and when the next window opens type quickly on your keyboard 161, make sure the desired color is picked and press OK on this and previous window to apply.
Repeat the same for the Yellow channel but choose 375.
Select the 161 channel (former Black) and press Ctrl + L to open Levels. Drag the middle arrow of Input Levels referring to the original to get similar darkness (to me around 0.30 looks similar shade). Press OK to apply and close.
Hold Ctrl and click on the icon of the 375 (former Yellow) channel to load its shading as a selection, and press Ctrl + Shift + I to invert the selection.
Make sure the 161 (former Black) channel is selected and press Ctrl + L to open Levels again. Move the right (white) arrow of the Output Levels (at the bottom) until the background matches in brightness the background of the original (to me 150 looks similar).
That's basically it based on my quick try with your image. This example should help you understand the basic idea and from there if you like, you can further play with the image if you feel you can make it any better with these two colors.
Regarding Spot colors, the idea is that a printing press uses 4 color plates (in Photoshop represented as the four CMYK channels when the image is in CMYK color mode) to print all possible process colors by mixing these four colors (inks). Spot colors are pure inks in cans and each spot color (ink) requires its own plate. Sometimes people print 4 process color plus an additional spot color for achieving a special effect like gold ink or pure corporate color to ensure color consistency which may not be as good when using the four colors mix. But very often, spot colors are used for printing with less than 4 plates to save money and sometimes for artistic effect with special inks.
Following the above example converts the CMYK document to Multichannel Color mode and you have only a few file formats available for saving in the Save As options. From these, practical ones are DCS and PSD files. Both are OK for printing but you may want to confirm with your printer. However if you want to place Multichannel image in programs like Illustrator or inDesign you have to use DCS.

Epson Inkjets -- horrible quality printouts, missing colors w/ Tiger 10.4.3

Ever since the updates to Tiger 10.4, my Epson Stylus C82 inkjet (which has worked perfectly for the past three years) will no longer print all four colors. I'm lucky if I can even get a b/w text print that isn't spotty and missing bands of ink all the way down the page. I've cleaned the print heads so many times I've used up half the ink in the brand new Epson CMYK cartridges I'd installed (thinking the problem was old ink). I also tried using a utility that was often suggested on the discussion boards, called Printer Setup Repair, which I think may have somehow made things even worse.
I decided maybe it was just time for a new printer. To experiment, I borrowed my brother-in-law's brand new unused Stylus C86, loaded it with new Epson ink, and it's even worse than the C82 -- it spools, loads the paper, the print heads make like they're laying down the ink, but it spits out a blank page. I can't even get it to give me a nozzle check confirmation pattern after cleaning the print heads in the Printer Utility. I took the cartridges out, thinking maybe the seal wasn't broken at the tips, but of course, they were (too easy -- wishful thinking).
With both printers I'm using the right Epson inks, the same basic all-purpose ink jet paper I've always used, and I'm trying to print simple one-page tests from Mail, Preview, and Safari, nothing fancy like Quark or Photoshop. This is just so bizarre, I can't imagine what's happened. I haven't been able to get a decent print since mid-September.
I should also mention, I first went through the unfortunately popular issue where Epson Printer Utility does not work with the Tiger-bundled Gimp drivers. And the whole thing where it starts to spool something , then crashes. So I installed Epson's latest drivers and set up those in the Printer Setup Utility. Of course, now I'm having trouble sharing my printer, but that's not exactly an issue, since I can't share a printer that doesn't print in the first place. I'm not sure if these issues are related to the aforementioned strange and hideous print quality, except that it all started happening around the same time after the Tiger updates.
Any info or suggestions would be much appreciated (as well as accounts of similar horror stories).
Dual 2.3 GHz Power Mac G5 Mac OS X (10.4.3) Epson Stylus C82 and C86 Inkjet Printers

Thank you for replying to my post.
Yes, I can do a nozzle check with the USB unplugged,
and I still get poor results on the C82 and nothing
on the C86. I just can't believe both printers are
broken. The C86 is new, and they were both working
fine previously.
Epsons are notorious for getting their print heads clogged. Run the clean print head routine a few times. If that doesn't work, return the new printer 'cause it's dead out of the box. The old printer, well, once Epson print heads get to a certain level of clogging, nothing will unclog them. Toss the printer and get a new one. Hint: HP and (some) Canon printers put the print heads in the ink cartridges, while Epson and (some) Canons have the print heads in the printers. Machines which have the heads in the carts also have an easy fix for severe clogs: toss the cart. Warning: HP printer drivers stink.
If you don't need colour, you might think seriously about getting a low-end laser.
I just got the C82 to print readably, but still
completely missing magenta and with minimal
fuzziness. This was just dumb luck though, from
letting the printer sit idle for several hours.
It's still clogged. Clean the heads a few times again, or just toss it.
And yes, I've tried setups through the Print & Fax
pref pane, which usually works better than going
through the Printer Setup Utility which tends to
freeze and crash.
I wish I could afford to just buy another printer.
But I'm still worried it's something to do with my
computer, since both printers are having problems
simultaneously, and they're both really good
all-purpose printers.
It's not your machine. It's Epson.
Dual 2.3 GHz Power Mac G5 Mac OS X
(10.4.3)
Dual
2.3 GHz Power Mac G5 Mac OS X (10.4.2)
Dual 2.3 GHz
Power Mac G5 Mac OS X (10.4.3)

Photoshop Save As PDF Settings Text loses 100% Black or Color Density is too High

I am taking a CMYK Photoshop file and saving it as a PDF for a magazine.
By request, the company has asked that the color density does not exceed 260%. In the output setings of the Save Adobe PDF dialog box, under color, I have:
Color Conversion: Convert to Destination
Destination: U.S. Web Uncoated v2 (told to me by the magazine to use)
Profile Inclusion Policy: Include Destination Profile
When I create the PDF, SUCCESS!!! it works where the color density is under 260%.
I verified in Acrobat Pro X by going to View / Tools / Print Production / Output Preview with the following settings:
Simulation Profile: U.S. Web Uncoated v2
Sample Size: 3x3
Total Area Coverage checked and set to 260%
HOWEVER, when I do this, the text goes from CMYK 0 0 0 100 to using all four colors. I have been recommended by the company to keep pure back on the text due to possible registration errors.
If I export out to PDF using the "PDF/X-1a" (inside photoshop pdf export), then I can get the text to keep 0 0 0 100 but the color density goes way over 260%.
Has anyone had this problem? I cannot get the color density to stay under 260% AND keep the text to 100% black.
Any help is always greatly appreciated.

Thank you Mylenium for your reply. What you have said makes sense but I am not sure how to implement it. I did a google search on Photoshop Multichannel mode and I did really find anything helpful or relevant.
I tried playing with the multichannel just the same. I made a copy of my photoshop document first (just in case I screwed up my file) and I converted it to multichannel mode from the current CMYK. (Image / Mode / Multichannel) Under "Channels" I looked at each layer (Cyan, Magenta, Yellow, and Black) individually and the text and other black areas in question were only on the black channel as it should be. Now that I am in multichannel mode, I cannot "Save As" a Photoshop PDF file so I had to do a Print to PDF option. I used the same export setting (or as close that I could tell) that I was using before and I still ended up with the same problem. My color density is under 260% but my black text is using 4 channels.
I also noticed that when I converted to Multichannel mode, the color of the image did change / shift a bit which also has me a bit worried.
Can you describe how I am to implement Multichannel mode to get my desired output? Also, can you elaborate on "custom channel for text blacks"?
I appreciate the help, thank you!

When I export to PDF, the black text is printing in full color instead of just black

I have Pages 09 (version 4.0.5). I am exporting a document to PDF and emailing it to a copy shop for printing. The document has a color cover, and 36 pages of black text inside. The copy shop is telling me that the pages with black text are printing as color pages instead of black and white pages. I need to figure out how to get them to print black to keep costs down. Is this a problem with my file, with the PDF export, or with their print settings?
Things I've tried...
1. Using the color palette, I have switched to the color sliders mode and changed all the text to CMYK with 100% black and 0% everything else. I have also tried changing it to grayscale with 0% brightness. Neither of these seemed to have an effect.
2. I downloaded the trial version of Adobe Acrobat Pro and converted the PDF to grayscale. This worked, but it's only a temporary solution.
Any other ideas?

Peter,
It's a pretty safe assumption that your average Joe isn't using text styles, but in this case you're talking to a guy who has worked as both a prepress technician and a graphic designer in a former life. I just don't have all the software of the trade at this point in my life. If I did, I sure wouldn't be messing with Pages and Preview. Although overall I'm pretty impressed with them, considering what they are.
Anyway, I am using text styles and I made sure to update them all. The PDF still came out with the rich black color. I have a feeling Pages' PDF exporter automatically converts all black to that four-color rich black on the assumption that you'll want it. I wouldn't care, especially since I'm just printing at a copy shop with no special quality requirements, except that we're printing hundreds of these things every week, and the full color prints more than double the cost.
Thanks for the help, guys! It looks like filtering the PDF through Preview will do the trick. If anybody can confirm a way to do this directly in Pages, I would appreciate not having to go through the extra steps.
Ben

Getting lines between colors in Illustrator

Hi,
I have a problem and I'm looking for some advice. I dropped a raster image into Illustrator (AI) and with Live Trace, turned it into a vector image that looks excellent on my monitor. However, when I load the vector file into a PDF and then open the PDF, I see small, light gray hairlines between the colors.
I'm making a product label for a client. He wants a particular photograph (JPEG) for the background. The printing house wants vector images in CMYK.
I'm fairly new to AI and probably not using "approved methods" although I took what I thought were logic steps to achieve my desired end.
I took the RGB JPEG, converted it to a .tiff in CMYK. I also tried converting the JPEG to .bmp and .esp - all in CMYK, before moving to AI. I Also tried placing the JPEG directly into AI.
I dropped those images into Illustrator separately and did Live Traces on each. At this stage, each attempt gave me excellent vector images in CMYK, but went wonky when I transfer to PDF.
Oddly, when I make a hard copy of that PDF on a hi rez digital printer (2400 dpi), the lines do not appear. However, I am still very concerned about those lines, because I will be sending a job off to be done on four-color offset printing. I'm sure the printer will freak out if he sees those lines and I am even more concerned that those lines may show up in the four-colour print process.
A local graphics person I spoke with suggested I would find my solution in Pathfinder, but I tinkered with that feature quite a bit and could not resolve the problem. Although, I wonder yet if that may be where I might find the solution, because when I hit Expand the blue path lines seem to correspond with the troublesome gray lines.
Someone else told me to hit Expand and then turn off Stroke. I believe I did that correctly, but there was no difference. I also saw no difference when I applied the maximum value for the Stroke. Other attempts at finding a remedy included Resample deselected, then Resample with a resolution of 300,
This project is driving me nuts and I'm hoping I can find some help.
Matt

@ Gustavo
I did not attempt going back to Photoshop with the PDF, but when I loaded that PDF into AI, the lines were not there.....strange!
As you will note from the above comments, I have found a solution to my problem, but I am posting an enlarged screenshot of part of an image showing these lines, just so you'll see the snag ran into.
Now, if anyone else asks about this, you'll be able to help them avoid the frustration I encountered.
Matt

InDesign Workflow with spot colors only

Please can someone explain me why InDesign treats working with four spot colors differently than working with CMYK? They are just four colors or channels, right? What is the difference between Cyan or PANTONE Reflex Blue?
It is true that 99% of the time CMYK is used. It is also true that you can work in CMYK and tell the printer to put a different ink instead of the a Cyan, Megenta, Yellow or Black ink. The project I work on now involves four Pantone spot colors and a few illustrators how need/want to see what they are doing, so...
The question is mainly because InDesign is soooooooooo slow working with spot colors. It feels slower than Quark Xpress 4.11 on a Mac OS 9 G4 machine.
Many thanks!
[-> InDesign CC, MacBook Pro 7i 2011, SSD, 16 G RAM, 1 G GPU]

I have never seen ID slow down with spot colors, but, I have not gone past CS5.5 nor do I work with OSX, both of which have many threads releating to screen draw times, and general lag.
SproetS wrote:
Please can someone explain me why InDesign treats working with four spot colors differently than working with CMYK? They are just four colors or channels, right?
I would suggest working mostly in Overprint Preview when working with Spot Colors.
What is the difference between Cyan or PANTONE Reflex Blue?
Excepting that they are both defined colors...everything about them is different.
Consider this - c, m, y, k are all spot colors. They are base colors, not different (to me) than Warm Red, Rhodamine Red, Reflex Blue, Pantone Green, Pantone Purple, Pantone Violet, Pantone Rubine Red, there are a few others..
In you color pallet, Yellow is not a spot color - it is a mix of (typically) y and 0~20% m.
Same for each color in the default pallet - 0~100% of c,m,y,k
It is true that 99% of the time CMYK is used.
Many spot colors cannot be accurately reproduced in the cmyk spectrum.
It is also true that you can work in CMYK and tell the printer to put a different ink instead of the a Cyan, Megenta, Yellow or Black ink. The project I work on now involves four Pantone spot colors and a few illustrators how need/want to see what they are doing, so...
Those days are gone. You would need to be more familair with the hammer and screw approach to avoid overprint mistakes, tints are not the same as transparencies, many hurdles here that have long been forgotten. What you would see on screen would be nothing near to the actual project.
It should be determined before preceeding if the project will be printed cmyk or as 4 spot colors.

Colors in FreeHand

When I opened a Freehand document, the color mixer went to
all zero amounts but the area below the four color slides became a
magenta-like color (with all the values at zero, this color should
be white). Also all the colors in the color list then became shades
of magenta. When I slide the values to the right, they all remain
shades of magenta.
Any suggestions on what to do?

> When I opened a Freehand document, the color mixer went
to all zero amounts but
> the area below the four color slides became a
magenta-like color (with all the
> values at zero, this color should be white). Also all
the colors in the color
> list then became shades of magenta. When I slide the
values to the right, they
> all remain shades of magenta.
> Any suggestions on what to do?
This happens sometimes in Windows. I don't know what actually
causes it but it has something to do with color management.
In XP it my be fixed by
- Removing incompatibe icc profiles from the system. (by
guessing)
- Deleting FreeHand preference files (make a backup copy
first)
In Vista by
- Replacing very old kodak dll-files with newer ones. (can be
found with Google search)
In my Vista computer the colors were like that from the
start. Replacing dll files fixed the problem.
Jukka

Convert 4-color pdf to greyscale

I have a four-color pdf that I need to convert to greyscale. The pdf now is CMYK set for Press Quality. What are the best settings for high quality greyscale output in Advanced - Print Production - Convert Colors. I am using Acrobat Professional 8.0. Thanks

As I said, I have not had much success that way either. Pro had the preflight conversion to Grayscale. Since you have Std, you may have to simply use separate graphic tools to convert to Grayscale and then recreate the PDF. If it is a scanned PDF, then you could simply save to a TIFF, use a graphic package to convert to grayscale (I use Irfanview for this type of simple task) and then move the TIFFs back into a PDF. If you have a mix of graphics and text, you may have to deal with a bit more. If the print converts the text, but not the graphics, you might try extracting the graphics (bitmaps I hope) under the tools menu. Convert those graphics to grayscale and then replace the color images with the new ones. (work on a copy of your PDF just in case something does not work)

Book colors with Custom Color Suite

Is there any way to programmatically create a book color? Dragging one from the book to the swatch palette creates a book color, but the Custom Color Suite seems to only have options for four color, three color, and lab color.

In an AICustomColor, there is a variable AICustomColorTag, where you can choose kCustomFourColor (CMYK) , kCustomThreeColor (RGB), or kCustomLabColor (LAB), but there doesn't seem to be any way to tag a color swatch as a Book Color. If you just drag a color from a color book within Illustrator to the swatch list, it is tagged as a book color automatically. At least it is in mine... give it a try. When I create a color swatch programmatically as a lab color or whatever, I can then double click the swatch within Illustrator and change it manually to a Book color.
Weird.
There's actually a function in the AISwatchLibrariesSuite called FindStandardBookColor, that I'm using to look up a color definition from the color books by name, but it doesn't pull the "Book Color" tag with it, just the CMYK definition.

Problems with color from Photoshop to InDesign CS2?

Hi all,
Couple of questions:
When I select "Proof Colors" from "View", the color changes a little bit. Is this normal?
Also, on "View", "Proof Setup", which one should I select "Document CMYK" or "Working CMYK" or some other "Custom"
thanks for all your help,
Alex

>When I select "Proof Colors" from "View", the color changes a little bit. Is this normal?
It's not abnormal, but it will depend on what color spaces the objects are in and the color space that you choose to proof.
>Also, on "View", "Proof Setup", which one should I select "Document CMYK" or "Working CMYK" or some other "Custom"
You have a lot of choices for how to set up color management. I usually leave my settings set up for my most common situation, US Sheetfed coated and Adobe RGB, but if I have a special job I can reassign the document color space (notice I said Assign, not convert, in order to preserve the native object color numbers). You can proof the color in either the Working CMYK (the one in the color settings) the Document CMYK (if that's different) or something else entirely if you are repurposing an existing document for a new output method.
When you proof colors, InDesign calculates the conversions on the fly and displays the results. RGB objects will almost always show some shifting due to gamut differences, but the type and degree will depend on the rendering intent you specify. CMYK objects tend not to show as much shifting because the gamuts are likely to be closer, but again it will depend on the exact profiles and intents. Objects that are already in the chosen proofing space should not show any shift at all.
There is a caveat here regarding working in one space and outputting in another: If you want the colors to be as close as possible you will be converting to the new profile, which will by necessity change some color numbers to match the appearance. This is not usually a problem with things like photographs, but other things, like type, which is created as 100% K can be converted to a four-color mix which is not good. If you know the output conditions, I always recommend setting the document CMYK to that space when you start.
Peter

CS3 PMS Colors Inaccurate...

i originally created some artwork in CMYK, the printer suggested i make it a 2 color job to get better color (some of my cmyk colors were out of their press' gamut).
Since i don't have a Pantone's Tints Book, i had to rely on photoshop for matching the CMYK version to pantone equivalents.
For some reason, photoshop isn't displaying PMS colors as accurate as Illustrator.
In photoshop, the Spot Channel version matches pretty close to the CMYK version, but once it is placed in illustrator it's obvious that it doesn't match the CMYK version at all. Which is weird because when i place CMYK photoshop files into illustrator they match perfectly.
I am using the same color settings across CS3 (set in bridge).
Sample of Files:
http://img440.imageshack.us/img440/5010/duotonezp1.jpg
Sample of Random PMS colors:
http://img370.imageshack.us/img370/4328/spotcomparesb2.jpg

Silence,
Some notes, which I hope are helpful here...
>(some of my cmyk colors were out of their press' gamut)
If the are CMYK, they are, by their very definition, within press gamuts. If your colors are out of gamut, they've been defined in some other color space, such as RGB, which has a considerably larger gamut.
> i don't have a Pantone's Tints Book
You need to purchase a current Pantone spot color to process swatch book. If you are doing work for print reproduction, it is as important as a calibrated monitor. If nothing else, it will quickly show you which colors will and which colors will not be accurately translated to standard four-color process colors.
>For some reason, photoshop isn't displaying PMS colors as accurate as Illustrator.
You do not have your color spaces synchronized across your CS3 apps. If you are using the same-level versions (particularly CS3), this is easy to accomplish in your app's preferences. Or you are using different color spaces for your different images.
Neil

Sort Rows by Color?

I have color coded some of the rows for a project I'm working on and would love to sort all the 'colored' rows together. Is there a way to sort by the color that I've chosen to fill each row with?
When I had only two colors I was using a workaround. I added a check-box column and had one color = a check mark. That allowed me to sort the checkbox column. Now I have four colors and this doesn't work any more.
Any ideas?

Quick & dirty solution:
Add a column with the header marked 'color'
Then use numeric or text entries: Red, Blue, Green, Black, 1, 2, 3, 4 ... a, b, c, d, or whatever for your color codes in that column.
Then sort by the 'color' column.
Now mark the 'color' column as hidden.

Four color theorem

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