Histogram & Scope are Slow to Respond

[Lukeman]

Hi all,

The histogram and scope have about 5 second lag as I'm editing the curves adjustement on a 2mb jpeg photo (taken on an iphone). This destroy the work flow as you can imagine.

Doing the same thing on a 250kb jpeg photo has less than a second delay - which is business as usual. 

I'm using a macbook Pro 15" mid 2012 with NVidia videocard and 16gb of ram on High Sierra. All software is fully updated - mac, Nvidia and Photo.

Does this seem normal to you? It doesn't to me. I use Davinci Resolve for producing films on the same machine, and the colour scopes respond instantly to running film. Is there a tweak in Photo that I'm missing, or is it something to be improved?

Thanks in advance for your responses.

groetjes,

Luke

 

 

[Lee D]

I've tested using some 20MP images and the Histogram updates within a second or so when editing a Curves adjustments on one of our systems. You can try changing the Display setting in Preferences > Performance and also try turning of Metal compute/hardware as acceleration.

However in the Photo persona updating the histogram is a background task.

[Lukeman]

Thanks for your response, Lee. Metal hardware acceleration wasn't on, but it was chosen in the "display" menu. Switching it to another selection pretty much solved it to within a second response time. Thanks for the pointer.

I don't fully understand those choices - is there somewhere to read up on the explanation of "software, open GL and Metal". The help seems to be a bit out of date, but maybe I don't know how to find the info.

thanks again,

Luke