Re: [NTG-context] color question

On Oct 10, 2006, at 12:30 PM, gnwiii@gmail.com wrote:

On 10/10/06, Alan Bowen wrote:

...

If this is OT, my apologies to all.

I am currently using ConTEXt to produce PDFs with a colored background which I specify using R G B settings. Unfortunately, this background does not look the same when others open the files on their computers. Is there anything I can do at my end to correct this?

There are well-known differences between various computer brands, and individual PC's generally vary widely. If you need really good agreement, then all the systems need to be viewed under similar light conditions and calibrated (e.g., using a colorimeter, or at least the GretagMacbeth ColorChecker, a printed chart) and you want to generate PDF's with a specific colorspace (not just deviceRGB). For most purposes, it seems to work to use a rough "sRGB" setting where you adjust the monitor (brightness, contrast) to approximate gamma=2.2. Check this with: <http://www.normankoren.com/ makingfineprints1A.html#Monitor_test_pattern>.

Many LCD's and worn-out CRT's like the ancient NCD on my desk will fail even this simple test.

-- George N. White III Head of St. Margarets Bay, Nova Scotia

Henning and George— Thanks for the replies. I had suspected that I was at the start of a search for yet another Holy Grail. Still, I will look into this sRGB (which is new to me), but first I had better see if I can calibrate my own monitor properly. (It failed the Monitor test.) Alan