5k iMac, 2. Monitor and dpp4. = Slow ?

[annmpacheco]

The main difference between DPP and LR is that during import LR creates the so called previews. When you zoom on an image it renders the image quickly using the preview file. The advantage is that the files are rendered faster once they have been imported, because the preview file is much smaller and has already been demosaiced. The disadvantage is that the "import" and the creating previews process takes a long time and in the process it created a lot of nested garbage on your disk drive that fills it up. Plus the actual conversion process isn't any faster. (e.g. batch processing)

DPP on the other hand does not have an import process, so every time you open a raw file it has to perform demosaic calculation and render it from scratch.


Having said that it shouldn't take 8 seconds to render a 1DX RAW file, I just tried with a MacBook Pro and these are the numbers.

2015 Mac Book Pro, El Capitan, 16GB RAM, i7 CPU, 512 GB SSD (the NVMe interface on MBP gives 800MB/sec read speed)

average time to render 1DX RAW in DPP 4.3 ~ 3.5 seconds



Hope this helps




I just tried on this machine and here is the number

render 1DX RAW file off SSD

Thanks Arash for that explanation, I understand now what each program is doing and what the machine is doing to perform that task. I also know a "bit" more about de mosiacing of the RAW file after reading and trying to understand the rendering process, thanks. Is there a way to reduce the nesting garbage that resides on the HD from LR? Is it a matter of deleting previous library backups?...

[arash_hazeghi]

Thanks Arash for that explanation, I understand now what each program is doing and what the machine is doing to perform that task. I also know a "bit" more about de mosiacing of the RAW file after reading and trying to understand the rendering process, thanks. Is there a way to reduce the nesting garbage that resides on the HD from LR? Is it a matter of deleting previous library backups?...

rendering means:

read the RAW data, calculate demosaic, apply WB, sharpening, NR, lens correction etc. until the the value of each pixel is final.

What is being discussed here is the difference between 4K/5K displays and a conventional display. An HD monitor (1920X1080) has about 2 Mega Pixels. a 4K monitor (3840 x 2160) has about 8 mega pixels. The system only renders the pixels that are visible on the screen. so at 100% view a 4K screen requires 4X more pixels to be calculated before the picture is displayed in its final form.

hope this helps