This is a continuation of yesterday’s post. I took a look at some of the other Photoshop sharpening filters on the Bruce Lindbloom test image. “Sharpen More” with normal blending exhibits the lime-green artifacts: With Luminance blending, the color artifacts are absent: Is “Smart Sharpen” smart enough to avoid color artifacts with normal blending? No,… [Read More]
Archives for June 2014
Sharpening and luminance
If you just fire up Photoshop and sharpen an image with, say, unsharp masking, the program will apply the sharpening kernel independently to each layer of the image. Occasionally that causes artifacts. Way back in the 80’s, canny scanner operators would sometimes convert the image to CIELab and sharpen only the luminance axis. In the… [Read More]
Closer firehouse pictures
Yesterday I made some more images of the restored fire engines, this time with the Costal Optical 60mm f/4 on the a7R, so I could get a little closer. I continued to use the neutral density filter to keep the exposure times long enough to mitigate the a7R shutter shock. Focus stacked with Helicon Focus… [Read More]
More Firehouse pictures
I’ve been working with a couple of new — to me — fire engines. These are quite different from the old warrior that I started out with, in that they are lovingly restored. The first pictures were in large part about the scars the equipment had gathered over the years. I was initially disappointed that… [Read More]
Back to Timescapes
I’ve posted images here, and here, of my on-again, off-again slit-scan series, Timescapes. I’m back at it, this time trying to make longer exposures. Here’s a four-hour one: Mike Collette, who runs Betterlight, the company that makes the scanning back I’m using for this series, told me about a mode in which the back will… [Read More]