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]
Search Results for: resampling
A tough test of Sony raw compression
[Added March 17, 2014] A reader posted a comment that you can see stating that there must be a systematic flaw in my simulation. He was right. Details are in the comments attached to this post. I fixed the error, and the results are reported at the bottom of this page. [Now, on with the… [Read More]
Sharpness testing, part 3
Before I deal with all the uncontrollable and semi-controllable variables involved in making actual test photographs, I did some simulation to make sure the target would work the way I thought it would under completely controlled, albeit unreal, conditions. I wrote this Matlab script: I ran it, and plotted the results. As expected, more low-pass… [Read More]
Reproducible results
From a reader: Always good to test for one’s self, but it has been known for a long time that RAW is just that….unprocessed raw data from the sensor (though many suspect Nikon does do some manipulation….different philosophy from Canon). RGB mode will change the look of your histogram, so consistency is important. Certain camera… [Read More]
Downsampling with Lightroom
These days I’m as likely to reduce resolution when printing as I am to increase it. The slit scan files come out of the camera at up to 9000×64000 pixels. The sweep panos are typically 8000×24000. Even if you’re not using such extreme file sizes, you may be downsampling too. If you’ve got a D800… [Read More]