John Sadowsky

John Sadowsky

Charlestown, MD

John S. Sadowsky is a retired wireless system and signal processing engineer. After 15 years as a professor of Electrical Engineering (Purdue and Arizona State), in 1998 he moved to industry to participate in the rapid development of digital wireles...
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Articles

Rolling Shutter on a Planetary Scale

HiRise, the High-Resolution Imaging Science Experiment, is a camera on the Mars Reconnaissance Orbiter (MRO). HiRise is a project of the University of Arizona’s Lunar and Planetary Laboratory, LPL, in Tucson, AZ. The mission is to photograph the surface of Mars in...

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Noise, ISO and Dynamic Range Explained

This article examines the noise characteristics of a modern digital camera. The primary spec used to specify the noise performance of a camera is Dynamic range (DR). Most expositions on DR tend to get highly technical very quickly. OK, this article gets technical here...

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Figure 3:  Gamma level histograms with logarithmic vertical axis.

A Better Histogram

The photo-histogram is probably the most ubiquitous exposure tool in digital photography; that is, short light metering itself.  It has been with us more than 25 years, and it hasn’t changed much.  The histograms we are familiar with are calculated from transformed...

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  • John Sadowsky
    John Sadowsky
    Participant
    Posts: 96
    Capture One – Pro Tips
    on: July 2, 2020 at 10:18 am

    Mike:  I’ve been subscribed to Reiffer’s YouTube channel for some time.  I think I originally learned about him from one of your posts.  I also believe I learned about Scott Williams from one of your posts.  Great finds!  Keep up the good work!  Dave Grover is fantastic – but there are so many different styles of post-processing it is really worthwhile to see many different approaches.  I personally liked Kevin’s video with Drew Altdoerffer.

    Here is another one: CaptureOne YouTube playlist from Ted Forbes.

    JSS

    John Sadowsky
    John Sadowsky
    Participant
    Posts: 96
    Re: Other Raw Converters
    Reply #1 on: June 19, 2020 at 10:07 am

    Luminar 4 is currently advertising 1/2 price sale.  Of course, the sale started 2 days after I purchased at full price: $89.

    Quick Summary:  Luminar 4 uses AI.  It does a pretty good job very quickly, eliminating a lot of masking work.  The skin tone and blemish tools are really impressive.  In my opinion, it will not replace Lightroom or CaptureOne for detail processing, full control of color adjustments, etc.  But if you want to process a lot of images fast with just a couple of slider adjustments, it does an amazing job.  I just had a bunch of slides from the 60s and 70s scanned, many rather poor quality.  Cleaning those up will be an excellent L4 task.

    JSS

    John Sadowsky
    John Sadowsky
    Participant
    Posts: 96
    Re: Capture One Update
    Reply #2 on: May 21, 2020 at 7:27 pm

    Thanks, Mike!  That was a really cool tutorial – I’ve not seen that technique before.  I haven’t tried it yet, but cranking up sharpening might also be useful for the YUCK-DELETE layer – similar to structure.

    JSS

    John Sadowsky
    John Sadowsky
    Participant
    Posts: 96
    Re: Capture One Update
    Reply #3 on: May 21, 2020 at 9:34 am

    The before/after and heal/clone tools are great improvements.  Now, they need to improve their soft proofing tools for working in the viewer:

    • rendering intent in recipes (Currently, you have to set the rendering intent in C1 Preferences color tab – this should be part of the recipe dialog.  At very least there should be a way to switch between relative and perceptual with a single click during soft proofing.)
    • black point compensation in recipes (available in the print dialog, but not in recipes)
    • color gamut warnings (not available in either viewer or print dialog)

    Of course, you can click soft proofing on and off with the proofing button.  It would be cool if the before/after split view could also be used for soft proofing.  One can wish …

    There is a request forum on these issues on the C1 support page.

    JSS

    John Sadowsky
    John Sadowsky
    Participant
    Posts: 96
    Re: Capture One Keywords and a Bug
    Reply #4 on: May 10, 2020 at 5:09 pm

    Oh – I remember debase/Fox Pro.  I was on the program committee for one of the first IEEE conferences to take electronic paper submissions.

    JSS