Paul has a post on his blog about Black and White Conversion with GEGL’s c2g (color2gray) in GIMP. We had that here too, and way before him (because Joel blogged about it….). But he has looked deep into this and has helpful instructions about when and how to use it. Verdict: Quite useful, but not the tool to make all other monochrome conversion tools useless.
The image is stolen from his site.
Podcast Video (39,7 MB) [19:38m]: Play Now | Play in Popup | Download
Torrent: Download Joseph's images and HDR files: DownloadThis is a repost of Episode 84 – there seem to be some feed problems. there is no need for download if you have seen 84 already.
This week I start with a short introduction into autostereoscopic images, see two posts below. Then I cover the GEGL operation “c2g”, which converts acouloured image into a monochrome image with a lot of noise or other other effects. It’s a “try out” thing – up to now I have not found documentation. Perhaps one has to look into the source. Be warned – some parameters can kill the program.
Then Joseph tells us. how easy it is to make “HDR” images with QTPFSGUI. It’s not as complicated as I feared. I’ll try it soon myself. The website Joseph pointed me to is here.
00:28 Autostereoscopic images
02:10 Petersons image with GEGL c2g
03:30 c2g is used
06:30 Introducing Joseph
07:00 Introduction into HDR photography
09:00 QTPFSGui
10:00 Aligning the images
10:30 waiting….
11:20 Editing tools
12:10 Set the parameters
12:50 Save the image
13:00 Change the EV values
14:30 Tone mapping
15:40 saving in an LDR format (JPEG)
16:20 different effects
18:10 Web site with more info
This work is licensed under a
Creative Commons Attribution-Share Alike 2.0 Germany License.
Download the Video [19:38m]: Play Now | Play in Popup | Download Torrent: Download Joseph's images and HDR files: DownloadThis week I start with a short introduction into autostereoscopic images, see two posts below. Then I cover the GEGL operation “c2g”, which converts acouloured image into a monochrome image with a lot of noise or other other effects. It’s a “try out” thing – up to now I have not found documentation. Perhaps one has to look into the source. Be warned – some parameters can kill the program.
Then Joseph tells us. how easy it is to make “HDR” images. It’s not as complicated as I feared. I’ll try it soon myself. The website Joseph pointed me to is here.
00:28 Autostereoscopic images
02:10 Petersons image with GEGL c2g
03:30 c2g is used
06:30 Introducing Joseph
07:00 Introduction into HDR photography
09:00 QTPFSGui
10:00 Aligning the images
10:30 waiting….
11:20 Editing tools
12:10 Set the parameters
12:50 Save the image
13:00 Change the EV values
14:30 Tone mapping
15:40 saving in an LDR format (JPEG)
16:20 different effects
18:10 Web site with more info
This work is licensed under a
Creative Commons Attribution-Share Alike 2.0 Germany License.
This is a new thing on Meet the GIMP!, an interview. I talk to Joel Cornuz from the Linux Photography Blog about the differences in 8 and 16 Bit postprocessing.
But before that you’ll learn a bit about the Confoederatio Helvetica (Latin) Schweizerische Eidgenossenschaft (German) Confédération suisse (French) Confederazione Svizzera (Italian) Confederaziun svizra (Romansh) Swiss Confederation (English) and
Geneva, Genève, Genf, Ginevra or Genevra. You’ll learn a surprising fact about how the Swiss cope with living an a country with four different mother tongues and nothing about Chocolate, Cheese and Swiss Army Knifes. Neither about CERN, the Red Cross and all the other institutions in Geneva. As we talk all the time in a video podcast I’ll show you a slide show of Joel’s images from his town and country.
I went into the interview knowing that I am not missing much with 8 Bit only in GIMP. But now I miss the 16 Bit option and hope that GEGL will solve this problem soon. 8 Bit is not a problem with images which contain a lot of colours and which get not much post processing. But if you tweak the curves of a nearly monochromatic image too much you are in trouble because you loose colours by interpolation and rounding errors. And so you end with 100 instead of 256 different shades – and that’s not enough for a smooth image.
As you perhaps recall I have taken ways around this problem by using two differently converted files from one RAW image. This would often not be necessary with 16 Bit.
Joel shows another way around this problem – post processing in cinepaint. That’s a hypertuned image processing engine in an old and a bit rusty GIMP 1.9x chassis. I’ll look into that and do a video about it in the future.
00:23 Welcome
00:38 Interview with Joel Cornuz from the Linux Photography Blog
23:43 Linux Photography Website
25:25 The End
TOC made by paynekj
Did you like this interview? Shall I make more of them or do you feel this was a waste of time? Please tell me your opinion. You can leave your comments on this blog or write me a mail.
This work is licensed under a
Creative Commons Attribution-Share Alike 2.0 Germany License.
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