Episode 196: ENIAC and Me

ENIAC and MeDownload the Video! (42:02, 140 MB)

Download the Companion File! (3.8 MB)

Watch at YouTube

Some timing issues pushed this video back and back again in time – and now it’s Christmas! Have nice Holidays!

In this video I try to change history and put myself in an old image of the first electronic computer, the ENIAC.

The original image is an US ARMY Photo under Public Domain, downloaded from Wikimedia.

As this is intended to be the base for a class project, I don’t go into the depth of GIMP but try to cover a lot of ground on a beginners level. And of course I make some mistakes…..

Links and Notes:

Episode 163 – Curves
Episode 094 – Curves
Episode 083 – Grit and Grain
Episode 073 – Layers

Our Wiki also covers Layers and Curves.

The nice image of the Rolleiflex has been made bay Rid Sevilla from Hawaii Camera Style

The image in this post has been altered a bit more with the GIMP filter “Old Photo” under /Filters/Decor/Old Photo.

The TOC

00:00:00 Intro
00:02:04 Opening an image from the Web
00:03:02 Loading an image from disk and some mistakes to avoid when making your image
00:03:55 Getting an image into another one
00:04:30 Measure Tool
00:05:00 Scaling to the proper size
00:05:25 Copy and Paste between images
00:06:10 RGB- and Grayscale Mode
00:06:30 Save the image in XCF format!
00:07:54 Isolate the person from the background with a layer mask, the Free Hand Selection and a brush
00:10:10 Free Hand Selection
00:11:30 Undo
00:12:15 Tedious paint work
00:17:30 “Optimizing” the mask with the curves tool and a blur
00:19:30 Finding the right position and scaling a layer
00:22:15 Adding the Curves Tool to the Toolbox
00:23:20 The Curves Tool
00:26:30 Adding grit and grain by extracting the grain from the image
00:30:00 Bucket fill tool
00:31:08 Try stuff with a layer copy
00:33:06 Adding light and shadows
00:38:15 Summary
00:40:20 Move a stack of layers, keeping them aligned
00:41:10 Saving and exporting the image
00:42:02 EOF

Meet the GIMP Video Podcast by Rolf Steinort is licensed under a Creative Commons Attribution 3.0 Unported License.
Permissions beyond the scope of this license may be available at http://meetthegimp.org.

Episode 080: Hi Bert! (Ernie not included)

Download the Video!
Download the companion file! (…if there is one…. 😉 )

80This show is two days late – lots of work and again some eye trouble. This time the other one – but it is working out.

Bert (Ray Adagio on the Forum) is the star of this episode. He has written some great scripts and enhanced others, the Zone Adjustment script for example. And now he has tackled rotation. You just have to mark two points on a vertical or horizontal line and click – the rotation starts. Ok, the tool from the toolbox has way more options, but usually you don’t need them.
Bert has also started a discussion about sharpening in different colour modes. Sharpeneing the “L” of LAB should be the best way, but this involves a lot of lossy math in 8 bit mode. Forget about it. But sharpening the “V” of HSV can be an alternative.

The animation in this post has a lot of artifacts due to the 256 colours of the GIF image. The real ones are better. All the example images are in the companion file of episode 79, not 78 as I said in the video. Only the one with selective sharpening is in the ZIP file for this episode.

I add a way to do a selective or high pass filtering in HSV. Perhaps in a script on a server near you in the future. 😉

Sharpening is a topic that has to covered in later episodes. On can sharpen a colour channel (gree is best most of the time) or use different values for the USM (unsharp mask) algorithm. How that thing really works would be interesting too.

Information about the DOCMA Award 2009 can be found in the forum. I’ll update that tomorrow.

The TOC

00:30 DOCMA Award Challenge
02:30 Subscribe and donate
04:20 Writing scripts
05:00 Rotation script
06:20 Install a script
08:00 Missing folders – no problem
08:45 Using the Rotation script
11:25 Sharpening in LAB?
12:30 HSV and LAB
14:45 Differences between RGB, HSV and LAB sharpening
20:40 Conclusion
21:15 Decompose
22:00 Unsharp mask
23:30 Adding a layer mask for selective sharpening
24:00 Edge detection
25:30 Temporary layer for controlling the effect
27:30 Recompose the image
29:00 Adding an image into a new layer
30:00 Conclusion – there are more ways….

Creative Commons License This work is licensed under a
Creative Commons Attribution-Share Alike 2.0 Germany License.