Musings on color management, CHROMiX products and services and other relevant topics.

Friday, July 23, 2010

Transmissive profiles

We've done a flurry of transmissive profiles for different customers in the last few weeks, and it occurs to me that this might be an area of profiling that not too many people know about. Readers of this blog will be familiar with calibrating and profiling a display - which results in a monitor profile. Also, you can use a device that measures reflective color to make a printer profile. But a different flavor of printer profile is the transmissive profile.

Instead of working with material that is intended to be displayed using some kind of light illuminating the front of the image, you can make a profile that is specifically for an image that will be lit from behind - back lit, and the color you see from this material is transmitted through the media. People who use transmissive profiles are usually printing onto transparent or semi-transparent film for display purposes.

While it is technically possible to print onto film like this using a normal, "reflective" type profile - this will not normally capture the effect of light passing through this media. Especially for film that is less opaque, the effect of a light source transmitting through the semi-clear media and through the ink can best be captured using a spectrophotometer that is specially made for this purpose. And there are not too many of those around. At CHROMiX we use an X-Rite DTP-41T which is a specially modified DTP-41 that can measure transmissive light - and also can read entire strips of color at a time, rather than single colors at a time. Believe me, large targets can get very tedious one color at at time! Barbieri also makes a couple of models of spectrophotometer which can measure entire sheets transmissively. Even better!

Judging by the volume of transmissive material we profile, we might be the only commercial profiling provider around that offers this service.

If you'd like more information on this, contact or or call 866-CHROMIX.

Wednesday, July 7, 2010

10-bit color resolution for display

Eizo has given out procedures that document the ability to get a continuous 10-bit output from Photoshop through to their displays. It has taken several years for the various hardware and software players to develop this capability. The last link in the chain has been the graphics card manufacturers, but it looks like there are a few graphics cards that can now support 10-bit color - on Mac and Windows.

We've started to hear reports around the industry that people are actually making this work.

I would not rush out and change your whole workflow over to this just yet. You know what they say about the cutting edge of technology often becoming the bleeding edge. Just the same, it's nice to see that we can do this now.

Thursday, July 1, 2010

Shooting Fireworks

I thought I'd fire off some quick tips for shooting fireworks this weekend.

It is universally recommended that you shoot from a tripod if you have one. If not, a bean bag makes a good portable something to stick your camera on that will conform to the shape of your camera and help to hold it steady.

A good place to start with settings is to set the ISO to 200, aperture to f/8 and shutter speed between 5 - 15 seconds. If your first pictures are too bright and blurry, use a faster shutter speed. When the time comes for the grand finale, change to a faster shutter speed than you have been using. This will compensate for the brighter skies that will be lit up by the extra color.

Here's a link for more ideas: