LEDs and taking video of them...

I thought the idea was to linearize an otherwise logarithmic visual effect?, could be wrong. There have been threads on gamma correction of leds before here in the forum. Here is a table with a gamma correction of 2.25, see if that is interesting?

Man, I dunno... I'm pretty lost now, but I am using that SIN lookup table to perform a very nice 'wave' from left to right in my picture. Very pleasing effect.

Well if Sine wave is an interesting effect, save it to a sub, or file, for future reference. Just by looking at the numbers, the gamma table has a longer period before full brightness, when compared to the sine table.

The gamma table sure beats using a 0-255 step function, if you want an even ramp up and down effect. Using the 0-255 step function, the ramp up comes too quick to a visual full brightness. and on ramp down, it looks a bit more normal to me.

Yes, I agree the gamma table is worth a look-see. I will import it and give it a go. Thanks for providing it.

nickelflippr said:

I thought the idea was to linearize an otherwise logarithmic visual effect?, could be wrong. There have been threads on gamma correction of leds before here in the forum. Here is a table with a gamma correction of 2.25, see if that is interesting?

Code:

const unsigned int brightness[] = 	{0,1,1,1,2,3,3,4,5,7,8,9,11,13,14,16,
18,21,23,25,28,31,33,36,39,42,46,49,53,56,60,64,
68,72,77,81,86,90,95,100,105,110,116,121,126,132,138,144,
150,156,162,169,175,182,189,196,203,210,217,225,232,240,247,255};

Click to expand...

I like this lookup table. I added a few more values to it and now I have a very nice looking Knight Rider effect that I have named DoHoff, in honour of The Hoff.

Good deal. You can try other exponents like 2.4 for the gamma equation, it can be a very subtle, and subjective matter.

DoHoff...... haha, just waiting for the next reality TV show.