Author Archives: Jim

This may be old news to many of you, but I just stumbled on to it and nailed it down. The new(ish) Lightroom exposure control (Process Version 2012) works differently than the Exposure adjustment layer in Photoshop CS 6. While … Continue reading →

In about two weeks, I’ll be participating in a workshop on raw processing. The workshop, sponsored by the Center for Photographic Art in Carmel, brings together three developers of raw developing software (Eric Chan from Adobe, Brian Griffith from Irident … Continue reading →

From the mailbag: I really like the Stealth option on the Sony RX1.  How did you get that look on the RX1?  This may sound ignorant but did you cover all the front white labeling with a Sharpie or something … Continue reading →

The Nikon D4 uses all 14 of its bits all the time except for those lost to digital white balance. The Nikon D800E is at 14-bit device with all codes present except for those lost to digital white balance until … Continue reading →

At ISO 100, it looks like the NEX-7 has a 12-bit ADC: At ISO 200, more noise: at ISO 400 still more noise. Note that we’ve not seen the bucket at 32 counts occupied in one of the histograms so … Continue reading →

At ISO 100, there’s a big surprise; the 14th bit is AWOL: At ISO 200, pretty musc the same thing with a bit more noise. The odd dip to the left of the mean of both green channels is curious: … Continue reading →

At ISO 100, the D800E shows all codes in use except for the red and blue channel WB digital gain dropouts: At ISO 200 there are no surprises: At ISO 400, just some more noise. You can see that the … Continue reading →

Rather than use dark noise as a stimulus as in the preceding post, I have made a series of measurements of the histograms of the Nikon D4 and D800E, and the Sony RX-1 and NEX-7 when presented with a featureless … Continue reading →

I started a thread on Luminous Landscape about computing unity gain ISO from a single exposure, and it’s gotten pretty interesting. There have been useful discussions about what good knowing the Unity Gain ISO is in picture-making. One of the … Continue reading →