Mike Chaney's Tech Corner

Mike's Software => Qimage Ultimate => Topic started by: CHoffman on April 20, 2019, 12:12:23 AM



Title: RAW ISO
Post by: CHoffman on April 20, 2019, 12:12:23 AM
When I see ISO:125 (pushed to 320), what does that mean? The camera was set to 125. Where does the push info come from?


Title: Re: RAW ISO
Post by: admin on April 20, 2019, 01:30:18 AM
In the raw refinement tool, exposure is adjusted automatically (or you can do it manually).  When you do things like increase exposure or use the ODR tool, you "brighten" parts of the image and when you do that, it increases the equivalent ISO.  For example, if you shoot an image at ISO 125 but you end up having to increase the exposure to double the brightness of the original shot, that's the equivalent of shooting the same image at ISO 250.  And so on.  If you brighten the image some, and then add some ODR to increase the brightness of the shadows, the two are additive and increasing the exposure will add some to the effective ISO, then the ODR may add (or even subtract) to/from that.

If you have an ISO 125 image and you get "pushed to 320", it means that on average, the pixels in that image had to be boosted by 2.56 times in order to get to the final developed image.

Regards,
Mike


Title: Re: RAW ISO
Post by: CHoffman on April 20, 2019, 03:09:51 AM
Silly me- I didn't notice it was changing as I refined the image. Thanks!