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rstein
Science Pixie
Joined: 19 Aug 2005
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Location: Bremen, Northern Germany
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 Posted: Fri Aug 03, 2007 9:18 pm Post subject: Colour correction in GIMP - "Meet the GIMP" No. 4 |
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The 4th epsiode of "Meet the GIMP!" is out.
In this episode of my video podcast I show how to correct colours with layers in the GIMP.
For reducing the green tint of the image I add a layer filled with a bright magenta (white minus a bit green) and set the layer mode to "multiply". This reduces the green in the image proportional to the amount of green in each pixel. The amount of the effect can be adjusted by changing the opacity of the layer or changing the colour of the layer.
Then I add a bit of blue with a layer filled with a very dark blue (black plus a bit blue) and set the layer mode to "screen". Now the blue in each pixel is enhanced proportionally. This can also be adjusted.
What do you think about this one?
Rolf
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Rolf Steinort
Meet the GIMP! - Video podcast
My images at 23hq - ByeBye flickr!
e - m:a; i:l : rs a-t gorfnet d-o-t de |
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rmh1985
On the Mezzanine
(800+ posts)
Joined: 29 Nov 2006
Posts: 931
Location: Pennsylvania, USA
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| Posted: Sun Aug 05, 2007 11:43 pm Post subject: |
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Somehow I missed this post on Friday! I guess I'll have to check this part of the forum even when it isn't highlighted!
Thoughts: How do you know what color blue to use? Why not a light blue?
Also, I still can't subscribe through itunes - power search in itunes doesn't find it, and the button on the Meet the GIMP! - Video podcast - NEW! link gets me the "The webpage cannot be displayed" message.
I like the idea of baby steps in this process - I'll try to find an image of my own to color correct - if I have any that haven't been discarded!!!
Thanks, Rolf.
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Ruth
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rstein
Science Pixie
Joined: 19 Aug 2005
Posts: 2386
Location: Bremen, Northern Germany
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| Posted: Mon Aug 06, 2007 11:39 am Post subject: |
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I thought iTunes was working - I have 5 subscribers using iTunes for Windows. But I'll look into that issue.
What happens when you click the iTunes subscription link on my web page? I simply stole that from tfttf - no idea how that works..... 
The blue: I want to add a bit of blue, no red, no green. And that is a very dark blue. Light blue is a lot of red, green and even more blue.
I think I have to search for a way to get this more clearly transported.
Rolf
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Rolf Steinort
Meet the GIMP! - Video podcast
My images at 23hq - ByeBye flickr!
e - m:a; i:l : rs a-t gorfnet d-o-t de |
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JoeDaddy
On the Second Floor
(100+ posts)
Joined: 07 Dec 2005
Posts: 137
Location: South Carolina USA
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| Posted: Tue Aug 14, 2007 2:27 am Post subject: Episode #5 |
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| I just subscribed to the show on itunes (windows ver.) I think you are doing a wonderfull job with your video podcast. Keep up the good work. I'm still laughing over the way you ended the show Episode #5. Maybe one of your episodes could focus on keyboard shortcuts with Gimp? |
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rstein
Science Pixie
Joined: 19 Aug 2005
Posts: 2386
Location: Bremen, Northern Germany
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gocyclones
In the Basement
Joined: 28 Nov 2006
Posts: 1
Location: Altoona, Iowa USA
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| Posted: Wed Aug 22, 2007 7:17 am Post subject: TFTTF? |
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I think you need to have Chris interview you on Tips to help get your listener base up. I've subscribed via iTunes on Windows. Found you via the search in iTunes looking for GIMP podcasts.
Matt
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rmh1985
On the Mezzanine
(800+ posts)
Joined: 29 Nov 2006
Posts: 931
Location: Pennsylvania, USA
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| Posted: Wed Aug 22, 2007 2:47 pm Post subject: Re: TFTTF? |
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| gocyclones wrote: | I think you need to have Chris interview you on Tips to help get your listener base up.
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What a great idea!
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Ruth
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rstein
Science Pixie
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Posts: 2386
Location: Bremen, Northern Germany
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rmh1985
On the Mezzanine
(800+ posts)
Joined: 29 Nov 2006
Posts: 931
Location: Pennsylvania, USA
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| Posted: Fri Aug 24, 2007 8:36 pm Post subject: |
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Next step is the Focus Ring!
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Ruth
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rstein
Science Pixie
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BenHughes
In the Basement
Joined: 21 Sep 2007
Posts: 9
Location: Canberra, Australia
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| Posted: Fri Sep 21, 2007 3:42 pm Post subject: |
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Rolf, just wanted to say thanks for the podcast! I've been using the gimp for years now, but I'm still learning a lot from you.
PS, I searched and subscribed through itunes with no hassles.
Ben |
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cawpin
In the Basement
Joined: 09 Jan 2008
Posts: 2
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| Posted: Thu Jan 10, 2008 2:11 pm Post subject: Auto correction? |
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Is there a way to have GIMP auto match two photos' colors? I am trying to get completely off of Windows and Photoshop is the last thing holding me back. I actually use the stitching functionality in it on a semi regular basis for making panoramas. It works flawlessly and does and excellent job of normalizing all the photos for exposure and color. I have found Hugin for Linux for the panorama part but it doesn't do a very good job of matching the exposure across the whole pictures. It does a good job at blending the edges of the photos, just not the rest of them. How can I do this before stitching to get a more even result? If needed I can post the two results obtained from PS and GIMP/Hugin for comparison.
Last edited by cawpin on Thu Jan 10, 2008 3:43 pm; edited 1 time in total |
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BenHughes
In the Basement
Joined: 21 Sep 2007
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Location: Canberra, Australia
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| Posted: Thu Jan 10, 2008 2:30 pm Post subject: |
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If you're shooting RAW, you can just set all the pics to have the same white balance when you convert them.
If you're shooting JPG, choose a WB mode (daylight etc) rather than auto, and all the pics should have the same colours.
Ben |
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cawpin
In the Basement
Joined: 09 Jan 2008
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| Posted: Thu Jan 10, 2008 3:41 pm Post subject: |
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| BenHughes wrote: | If you're shooting RAW, you can just set all the pics to have the same white balance when you convert them.
If you're shooting JPG, choose a WB mode (daylight etc) rather than auto, and all the pics should have the same colours.
Ben |
Does the GIMP handle RAW correctly? I'm shooting with a Nikon D50. Also, is there a place to get lens correction files for Hugin? The stitching seems to be fine to me, but a correction would probably make it look even better. |
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Dom W
Almost there...
(500+ posts)
Joined: 17 Aug 2006
Posts: 745
Location: East Sussex, UK
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| Posted: Thu Jan 10, 2008 11:20 pm Post subject: |
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| cawpin wrote: | | Does the GIMP handle RAW correctly? |
Get UFRaw (there's a GIMP plugin version) and you'll be set - I use Lightoom/CS2 on a Mac as my main workflow tools, but have GIMP with UFRaw set up on both the Mac and my work PC laptop - works fine with files from a D70s.
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Luckily, only about 1% of the world population are red-heads ... I just happen to live with three of them ... |
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