the last word

We’ve seen that the sensitivity to luminance variation falls off as the luminance spatial frequency increases. If turns out that it also falls off as spatial frequency decreases, giving a band-pass filter effect, which sharpens edges, and gives rise to the Mach Banding that we’ve been looking at in the preceding posts. There are many… [Read More]

I reworked the luminance step wedge of yesterday’ post so that it consists of 10 Delta-E steps from zero to 80 along the gray (a* = 0, b* = 0) axis: The Mach Bands are evident. Then I created a similar image, with L* = 50, b* = 0, and a* starting at -40 and… [Read More]

Inspired by the last three posts, I’m starting a series of posts on spatial considerations in color vision, which an emphasis on what’s important to photographers. We’ll get started today with an illustration: Take good look at this image from a normal viewing distance: The bars are even steps along the grey axis in a… [Read More]

I ran the FFT analysis of yesterday’s post on a couple of more images. First, this old chestnut (thank you, Fuji):   Here’s what I got: For the last three octaves of spatial frequency, the two chromaticity components are about the same distance below the luminance component. Then there’s this image (thank you again, Fuji): Here’s… [Read More]

There was a great thread on the dpreview forum started by Jack Hogan (who has also posted in this blog), about anisotropy in anti-aliasing filters. In the generally erudite and productive discussion that followed, someone (I’d give him credit, but I don’t know his real name) made these comments about demosacing: From a reconstruction perspective,… [Read More]