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2 Messages

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80 Points

Sun, Nov 20, 2016 11:21 PM

Lightroom: Invalid value loop for color temperature/tint in black and white images

When working with a monochromatic (black and white image; in my case, a 16-bit TIFF) photos, it is possible to accidentally click into the numerical entry for both color temperature and tint under the white balance module.  If you type in any value (particularly if you think you are in, for example, the exposure slider), Lightroom provides a validation error requesting a value from [-100,100].  However, because no values are valid (since the image is monochromatic), you become trapped in a dialogue loop that cannot be exited without crashing the whole program.

Responses

46 Messages

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754 Points

4 years ago

Someone failed to do what is known as "Destructive testing." which means you do illogical things to try and break the program and observe and code changes to avoid that.
I was good at breaking programs where I used to work.  The code cutters would shake their heads at what I did but at the end of the process the software was spot on.

2 Messages

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80 Points

4 years ago

You know what they say about QA testers: a guy walks into a bar, and orders a beer.  He orders 9,999 beers.  He orders -1 beer.  He orders jfewiao;$#Q.

46 Messages

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754 Points

Exactly.

Champion

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5.2K Messages

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93.3K Points

4 years ago

I'm not able to reproduce that with a grayscale 16-bit TIFF created in Photoshop, imported into LR CC 2015.7 / OS X 10.11.5.  In my LR, the Basic Temp and Tint sliders are greyed out, with no numeric entry box visible.  The local adjustment Temp and Tint sliders are not greyed out, but I can enter numeric values for them without invalid-value issue you observed.  (See the screenshot below.)

Is your image an RGB image that happens to be monochromatic, or is it a one-channel grayscale image?

Which exact version of LR and Mac / Windows?  (Do Help > System Info.)

Can you upload a Quicktime screen capture showing exactly what you do to cause the problem?

582 Messages

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9.1K Points

John I don't get what you are showing when I send a color image from LR into PS, use the B&W adjustment layer to convert it to B&W  and then save as a TIFF. Back in LR when toggling the local adjustment brush the basic panel Temp + Tint boxes are still active.

Champion

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5.2K Messages

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93.3K Points

The image you've constructed still has three channels, R, G, and B.   In Photoshop, do Image > Mode > Grayscale, and it will be converted to a single grayscale channel.  That's the TIFF I showed in the screenshot.