I wrote a piece on the different worlds inhabited by those who consider raw files to be the reference for camera performance and those for whom the lodestone is a developed file. I posted it here, and put another version on the DPR Sony alpha 7 forum on DPR. In the ensuing discussion, several made… [Read More]
Search Results for: color space conversion
Noise reduction and downsampling
[Note. The bilinear and bicubic interpolation algorithms referred to in this article are the Matlab implementations. They are different from the Photoshop algorithms of the same or similar names. The Photoshop versions are reported on a few posts further on. Therefore, this post is primarily of academic interest.] It is axiomatic in photography that photon… [Read More]
Big vs little pixels
With the announcement of the Sony alpha 7S and its 12 megapixel sensor, the debate about the relative merits of big-sensel sensors and little-sensel sensors has heated up again. The two poles of the argument: Capture the image at as high a resolution as you can manage. If you need a lower-resolution version, you can… [Read More]
The intellectual underpinnings of MTF analysis of handheld images
A few days ago, I made a post with a handwaving defense of the use of slanted edge MTF metrics for analyzing handheld image sharpness. Today, I’d like to take another crack at it, this time with more rigor. The upside? A clearer basis for the capabilities and the limitations of the technique. The downside?… [Read More]
Removing the delta modulation component from Sony raw compression
Someone expressed interest is seeing how the Sony tone compression/expansion simulation would work with our test image if the delta modulation component were removed, leaving us with only the 13-to-11-bit tone compression and its 11-to-13-bit counterpart. I’m glad to oblige. Here’s the target image in Adobe RGB: Here’s what it looks like in Adobe RGB… [Read More]
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