Skip to main content
Adobe Photoshop Family

1 Message


70 Points

Sun, Apr 14, 2019 1:27 AM


Camera Raw: Raw conversion advanced options? Precise floating point engine, etc

Hi,I'm sure most of us want to squeeze optimal data out of RAW files.In order to do that, I am currently forced to use other software which uses precise floating point calculations in RAW file conversion (as opposed to ACR truncations and rounding, losing data in the process) and then if needed, import files to Photoshop CC.Same thing about being able to choose demosaicing algorithm and Lucy–Richardson deconvolution (blur reduction) and all those advanced features that one can ignore in not needed but can be put into an advanced menu if one wants to use them.I know that precise and accurate conversions take longer than wild approximations, but why not adding a selectable option for those users that prefer quality over not waiting those extra seconds?Open-source developers can do that with very limited funding, I am sure Adobe can pull it off even better.For those wondering which software I am using, it's Raw Photo Processor ( and Rawtherapee ( you


703 Messages


9.4K Points

2 years ago

In what way is acr using "truncation's and rounding, losing data in the process"?

163 Messages


2.7K Points

2 years ago

I’ll show you in a moment, but first I wanted to cover some of the details of using Camera Raw’s DNG HDR. First, the resulting file is a Linear DNG, which means it’s not a completely raw file; it’s what I call a half-baked raw file. The image has been demosaiced, but it’s still a linear gamma (1.0). Next, the resulting DNG file is stored as a 16-bit floating-point image, but the processing applied is done in 32-bit floating-point. Don’t confuse 16-bit floating-point to 16-bit integer images; it’s still a floating-point image. You can use all the processing tools in Camera Raw to adjust the image. However, one thing to note is instead of the normal Exposure range of +– 4 stops, the HDR range is expanded to +– 10 stops. The other adjustments remain the same  - Jeff Schewe | The Digital Negative