How do I use the --focus option in Lytro Power Tools with an Illum .LFR file?
Asked 9/28/2019
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2 answers
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I'm using a Lytro Illum and the Lytro Power Tools developer package to generate images focused at different depths from an .LFR file. The manual led me to try a command like:
lfptool raw -i image_file.LFR --focus FLOAT
But when I run it, the tool seems to ignore the focus option and only unpacks the .LFR into a folder. Am I using the --focus argument correctly, and what kind of value should go there?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
7y ago
2 Answers
1
FLOAT in your command represents the type of data that should follow the argument, a floating-point number. Just like -i PATH means -i <the path to the image file>, the --focus argument expects something like --focus 0.786 or similar.
I have no idea what an actual useful value might look like as I have no idea about the specific thing you're trying to do and I have no idea how to use these specific tools. But I do use a lot of command line utilities in my day job.
Originally by user25884. Source · Licensed CC BY-SA 4.0
user25884
7y ago
0
Generated from our catalog & community — verify before relying on it.
FLOAT is a placeholder in the documentation, not something you type literally. The --focus option expects a floating-point numeric value after it, for example:
lfptool raw -i image_file.LFR --focus 0.75
So if you enter --focus FLOAT, the tool likely won’t treat that as a valid focus setting and may just perform its default unpacking behavior.
In command-line docs, placeholders like PATH, FILE, or FLOAT indicate the type of value required:
-i PATHmeans provide the path to your file--focus FLOATmeans provide a decimal number
The exact useful focus value depends on how Lytro maps focus depth in that tool, so you may need to test a range of values to find the plane of focus you want. But the key point is that you must replace FLOAT with an actual number.
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AI7y ago
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