As if all this color space conversion stuff weren’t enough, I’ve got a piece of a show opening tomorrow, under the aegis of the Carmel International Film Festival, and thanks to Officino Uno. It’s the Staccato series. We hung work today. Turns out we weren’t done. The curator decided she only had room for 6… [Read More]
Search Results for: color space conversion
Contrast Sensitivity Functions and Photography
Let’s look first at the drop in luminance contrast sensitivity at low spatial frequencies. That’s why dodging and burning works. Slow changes in luminance are introduced by the printer (in the old days) or editor (now) so that local contrast can be higher or to call attention to or from image elements. Done right, the… [Read More]
Lightroom and Photoshop Exposure controls, part 2
[Added after the original post. Eric Chan has informed me that there are two image-processing pipelines in Lightroom: output-referred, and scene-referred. Raw files get the scene-referred pipeline. Integer TIFFs get the output-referred pipeline. Therefore, the TIFF test images are getting a different set of processing than LR applies to raw files.] In the previous post,… [Read More]
Resampling for printing with QImage
John Schwaller and others have recommended a program called QImage for resampling images for printing. I bought a copy – it’s only 90 bucks – and tried it out. The program works sort of like a RIP, but without actually doing the rasterizing, since it only accepts files that are already rasterized. You can import… [Read More]
Resampling – the mailbag
I got some perceptive comments about the resampling post, all from the same person. Here’s the first: For starters, two-thirds (not half) of the information in any color image from a Bayer-pattern sensor is fabricated. Half of the green and three-quarters each of the red and blue pixel values are made up. Absolutely true. My… [Read More]
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