, it is open source and it runs on Linux (and other Unixes), Windows and MacOS. I cover programs and tools for the digital photographer that are Open Source in the GPL or BSD way of thinking. "Pin It"){kind=logo}
Podcast Host: Rolf Steinort
Podcast Owner: meettehgimp
Website: http://meetthegimp.org
Location: Bremen, Germany
This is a video podcast about the GIMP. The Gimp is a very powerful image manipulation program. It is free (as in speech and in beer), it is open source and it runs on Linux (and other Unixes), Windows and MacOS. I cover programs and tools for the digital photographer that are Open Source in the GPL or BSD way of thinking.
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5/10/2013 | Download File (49.72 MB) - right click to download
In the last Episode I looked under the hood of JP(E)G and PNG. This time it gets a bit more practical – which is better for what? I tackle two examples from the GIMP Magazine web site and test, if they would be better saved as JPG or PNG. The Plugin “Save for Web” is really usefull for this task.(The image for this blog entry is a PNG by the way, showing JPG compression artifacts. As a JPG it would be five times the size. ) I “developed” a method for comparing two layers – just set the top layer mode to “difference”, make a new layer from visible and check that with the threshold tool for pixels, that are not completely black. After locating the problematic zones in an image with this tool, one can decide what settings are “good enough”. Conclusion: It depends. It depends on the file, your use case, your level of “good enough” and your compassion for people on a mobile device in EDGE-Hell. The show starts with a little extension of the last show, Pascal mentioned some options for saving a JPG file that I had overlooked. The TOC 00:00:00 Start of video 00:01:00 Progressive mode in JPEG 00:04:09 Progressive mode is not fully supported by browsers 00:04:23 Optimized mode 00:05:56 Baseline? 00:06:17 The quality setting 00:07:09 GIMPMagazine and MTG header image – PNG or JPG? 00:09:23 Checking for quality loss in JPG 00:10:03 Comparing two layers with difference mode 00:10:48 Using the histogram for analysis of the amount of difference 00:11:25 Locating the differences 00:13:50 Trying 85, 75 and 90 as quality settings 00:16:13 When in doubt, compare different settings 00:16:36 Save your work as XCF.GZ 00:17:12 Second example – a drawing 00:19:56 Conclusion 00:23:19 Stay at 4:4:4 for subsampling with photos 00:25:16 Final words of wisdom
4/24/2013 | Download File (49.72 MB) - right click to download
In the last Episode I looked under the hood of JP(E)G and PNG. This time it gets a bit more practical – which is better for what? I tackle two examples from the GIMP Magazine web site and test, if they would be better saved as JPG or PNG. The Plugin “Save for Web” is really usefull for this task.(The image for this blog entry is a PNG by the way, showing JPG compression artifacts. As a JPG it would be five times the size. ) I “developed” a method for comparing two layers – just set the top layer mode to “difference”, make a new layer from visible and check that with the threshold tool for pixels, that are not completely black. After locating the problematic zones in an image with this tool, one can decide what settings are “good enough”. Conclusion: It depends. It depends on the file, your use case, your level of “good enough” and your compassion for people on a mobile device in EDGE-Hell. The show starts with a little extension of the last show, Pascal mentioned some options for saving a JPG file that I had overlooked. The TOC 00:00:00 Start of video 00:01:00 Progressive mode in JPEG 00:04:09 Progressive mode is not fully supported by browsers 00:04:23 Optimized mode 00:05:56 Baseline? 00:06:17 The quality setting 00:07:09 GIMPMagazine and MTG header image – PNG or JPG? 00:09:23 Checking for quality loss in JPG 00:10:03 Comparing two layers with difference mode 00:10:48 Using the histogram for analysis of the amount of difference 00:11:25 Locating the differences 00:13:50 Trying 85, 75 and 90 as quality settings 00:16:13 When in doubt, compare different settings 00:16:36 Save your work as XCF.GZ 00:17:12 Second example – a drawing 00:19:56 Conclusion 00:23:19 Stay at 4:4:4 for subsampling with photos 00:25:16 Final words of wisdom
4/9/2013 | Download File (68.81 MB) - right click to download
The last episode was for absolute beginners, this one is for Geeks. I try to explain (and understand on the way) how images are stored in PNG and JPEG files. PNG (pronounced “PING”) does this lossless, the image can be retrieved in the same quality as the original. PNG works wonders with graphics with a lot of lines and clear colour areas, comics and logos for example, but it creates monster files out of photos and similar images. JPEG looses details, aquires artefacts and generally mangles the image. But it has so beautifully small files and the losses are in most cases invisible – except in the area where PNG is good. So both have their niche to live in. How is this done? I try to explain this without the math, using analogies, plaing with GIMP to reenact some stages and reducing the complexity a lot. If you want to know the exact facts, read up in Wikipedia, which was also my source of information, or look for other sources. I hope that I never crossed the border between simplification and telling wrong stuff – but I am really not sure. The math is really over my head, last time I had to tackle such a level a Pentax ME Super was still a new camera model. I am happy about any comments that improve my understanding – and all other comments too.
3/27/2013 | Download File (102.18 MB) - right click to download
This is an episode completely in “Beginners Level”, some of you have asked for such a thing. I go through the editing of an image and cover a lot of topics. Nothing really in depth, but you should be able to work your way through other material after viewing this one. I start with a short tour through the user interface of GIMP, you find more about that in the GIMP documentation and other places. In between there is a bit about saving vs. exporting an image – without the nasty and pointless discussion. The image itself has to be rotated a bit, cropped, treated with a bit of curves, burned, and dodged, given more omphh with a layer in overlay mode that of course has to be modified with a layer mask. Finally the image will be scaled down, sharpened and exported as a JPEG while the original XCF file is conserved. Quite a tour – so I needed nearly an hour .
3/17/2013 | Download File (70.64 MB) - right click to download
This episode is about using GAP, the GIMP Animation Package, and “The Book of GIMP”. I walk through one of the tutorials of the book and create a multi layered animation that will be used in a cleaned up form for these videos. I can not praise the book enough, you can read more in a former blog post. GAP showed some flaws, but this may be the problem of the Debian package that I used. “The Book of GIMP” has also a reference part. I compare that to the official GIMP documentation while looking for information about the Convolution Matrix. Before all that I tell you about a GIMP plugin for exporting a layer as a PDF file and I defend my new camera – 36 Megapixels may not be too much, they only show the limits of the lenses….. Cameras with smaller sensor sizes of course hit a barrier with more and more MP. The next episode will have animated lower thirds and a proper automatically generated title screen. ;-)
