Light Meter Application

Audio and Graphics
#1

Good Morning,

Has anyone done this?  I’m looking for some tips on how you could check the light level in a room.  I’m not looking for rocket science and I’m not looking for super accuracy.  I thought you might be able to do it by taking a snap shot with the camera and somehow checking the average color… or something like that.

Anyone have any tips?

Thanks!

Arthur

#2

Hi Arthur,

This might (emphasis on “might”) be possible by taking a camera shot, then using “.colorSample()” in a loop of many random iterations across the entire screen, then gathering up the RGB+A data and “averaging” it out somehow.

http://docs.coronalabs.com/api/library/display/colorSample.html

However, the performance might suffer a bit if you take like 100 color samples, and I’m not sure how accurate the entire thing would be. I guess you’d just have to test it out.  :) Also, I think .colorSample() might be a Pro/Enterprise-only feature.

Best regards,

Brent

#3

There are light meter apps out there, but they are all native.  According to a couple of stackoverlow posts, you can probably do it with Corona Enterprise as you need to call some native calls:

http://stackoverflow.com/questions/18271145/accessing-the-ambient-light-sensor-in-ios

Doesn’t look hard, but it’s a feature that won’t benefit many Corona Users so it likely won’t make it into the core.

Rob

#4

Thanks for the replies gentlemen!

Regards,

Arthur

#5

Hi Arthur,

This might (emphasis on “might”) be possible by taking a camera shot, then using “.colorSample()” in a loop of many random iterations across the entire screen, then gathering up the RGB+A data and “averaging” it out somehow.

http://docs.coronalabs.com/api/library/display/colorSample.html

However, the performance might suffer a bit if you take like 100 color samples, and I’m not sure how accurate the entire thing would be. I guess you’d just have to test it out.  :) Also, I think .colorSample() might be a Pro/Enterprise-only feature.

Best regards,

Brent

#6

There are light meter apps out there, but they are all native.  According to a couple of stackoverlow posts, you can probably do it with Corona Enterprise as you need to call some native calls:

http://stackoverflow.com/questions/18271145/accessing-the-ambient-light-sensor-in-ios

Doesn’t look hard, but it’s a feature that won’t benefit many Corona Users so it likely won’t make it into the core.

Rob

#7

Thanks for the replies gentlemen!

Regards,

Arthur