autodev trouble

[Rkonrad]

Hello Ivo or others out there

I find, quite regularly, that I can't achieve the same great results of autodev that I see from the temporary autodev that displays after a wipe. With my shot of m31 this is especially so. The galaxy is tilted at 45 degrees so I can't adequately select much of it. It almost seems hit or miss depending on how good a selection I can get with my mouse. I've tried experimenting with the detail range as well as the roi influence but am always disappointed.

Is there something I'm missing - or is there a way of getting at the temp stretch information and applying it?

Thanks!! Richard

[Rkonrad]

I read in another post, someone has expressed the same issue. The solution sounds like a compromise though (missing detail in darker areas). Is there another way around this?

Thanks Richard

[admin]

If you're stretching an image with a smaller galaxy against a starfield, then indeed you'll want to use a RoI.

The RoI is supposed to be a good representation of the dynamic range that you want to optimise for, so a slice of galaxy including an example of its brightest detail, plus some background should be a reasonable sample.

If you really want to, you can currently mimic Wipe's Temporary AutoDev, by running AutoDev w/o RoI and then use Develop (stretch as-is) to set the gamma to approx 0.41 (approximately reversing a 2.2 sRGB curve applied by AutoDev).

Lastly - this may or may not be a problem - some older screens (such as found in older budget laptops) are not well calibrated to show the full dynamic range. You can use this free online tool to double check.