Download the Video! (34:04 67.9MB) Download the companion file! (97.8MB)
It’s time for a guest again. Nachbarnebenan shows how to process a RAW image in the current (well, it was November…) version of Photivo. Photivo has a very different approach to image processing from GIMP and others. It’s more stacking up and tweaking of algorithms instead of making a series of changes one after the other. Fully non destructive and very powerful.
To isolate the model from the a bit to vivid background Nachbarnebenan produces two images from his RAW file. One is crisp and colourful – best for the model. The other one is soft and a bit dull – this tones the background down.
In the next episode he will show how to combine these two images in GIMP into one.
Photivo is a free and open source (GPL3) photo processor. It handles your RAW files as well as your bitmap files in a non-destructive 16 bit processing pipe with gimp workflow integration and batch mode.
Photivo tries to provide the best algorithms available; even if this implies some redundancy. So, to my knowledge, it offers the most flexible and powerful denoise, sharpen and local contrast (fake HDR) algorithms in the open source world. (If not, let’s port them 😉 ) Although, to get the desired results, there may be a quite steep learning curve 😉 .
Photivo is just a developer, no manager and no “Gimp”. It is intended to be used in a workflow together with digiKam/F-Spot/Shotwell and Gimp. It needs a quite strong computer and is not aimed at beginners.
Processed with Photivo
Basically it’s an image processing assembly line. You set the parameters, throw your RAW file in on top, wait for a moment and catch your image when it falls out of the machine.
Today I give it a try and rescue an image of a kite with it. It’s an impressive tool with a quite unique but understandable user interface. I’ll explore this further, perhaps it will enter my workflow.
The companion file contains both used RAW files and all the setting files created by Photivo.
I got a mail from Pascal de Bruijn, the man behind the p-code blog. He knows a lot about colour management, RAW processing and so on. He had seen episode 11 and pointed me to some errors and stuff that is new in UFRaw. So I read his mail and had a look.
This is really a fast forward through the program, nothing really in depth. It can be a guide for experimenting. If you know not much about RAW processing, have a look at episode 11. It covers some basics about the technology behind it.
I used the UFRaw version compiled by Pascal. You can find it for Ubuntu on his site – other OS have to look around. Start with the UFRaw home page.
I’ll have an eye surgery tomorrow (lens replacement) and had not much time to prepare this episode. TOC and more will follow. And I’ll be off screen for some days until I am allowed to read again.
1:50 Pascal’s e-mail blog.pcode.nl
4:16 – Fire up UFRaw!
4:30 – Color matrix vs. Color profile
5:57 — Working Color Space Profile
6:33 — Rendering Intent Option
8:50 – Details Restauration & Highlight Clippings
10:13 – Import base curves from .NCV
10:26 – Auto black point correction works perfectly!
11:13 – New features in new version of UFRaw
11:36 – LensFun
14:00 – Fix cromatic aberration
15:57 – Optical Vignetting
16:23 – Lens distortion – Panotools
17:16 – Lens geometry
Edit: Episode 76 covers some new aspects of UFRaw and corrects some mistakes. Look at it too!
RAW conversion was a thing a lot of you wanted to know something about. And in this show I tell you how to use the program UFRaw to get RAW images into the Gimp. My job was coming a bit into the way – I had to build the schedule for my school. So this show contains some ‘should be’ outtakes and perhaps I have overlooked some stuff. Please feel free to ask – I will be glad to answer all your questions in a follow up show.