Episode 201: OPSEC!

Download the video! (21:44, 43MB)
The companion file! (51MB)

Nearly all colour laser printers leave a pattern of tiny yellow dots all over the paper. These dots contain information about the printer and perhaps also about the time and date of the print, the IP of your computer and who knows what else. These codes are in there for at least a decade and the EFF has complained in vain. Reality Winner got cought with these dots – but perhaps they would have found out about her a bit later without them.

The EFF has a dorky video about that.

I have a laser printer in my office at school. What does it tell about me? I research that with help of GIMP 2.9 – which looks terrific and has a lot of nice new stuff on board.

And of course you get to see some of these new features.

The companion file contains the scan of the Ordnungsmaßnahmenverordung in different resolutions and the XCF file with the revealed code. The last paragraph on the page gives me the right to take away your phone and hand it back to your parents after a reasonable time – if it beeps again in my class. (A lot of kids would prefer the cane over this….  😉 )

I forgot about the serial number of the printer – this will be updated soon.

The TOC:

00:00:00 Intro

00:00:50 Leaking from the NSA
00:01:35 Little yellow dots on laser print
00:03:00 Gimp 2.9 fired up
00:03:30 Search for the yellow dots
00:04:20 Colour Channels
00:06:00 Extract a colour component
00:06:40 Split view – new in filter dialogs
00:07:15 Searching for the pattern
00:07:55 New things in the layer dialog
00:08:30 Searching for the pattern
00:10:10 Crop tool
00:10:30 Measuring the pattern
00:11:35 Adding a precise grid
00:12:45 30 bytes of data in the yellow dots!
00:14:00 What’s not in the code?
00:15:00 Printing leaves traces
00:16:25 Blunder of “The Intercept”
00:17:00 Anonymising a scan with the threshold tool
00:18:30 The mono mixer for getting red back in
00:20:00 Return of the Minox for leakers?
00:21:00 We need a guide about OPSEC!
00:21:44 End of video

Meet the GIMP Video Podcast by Rolf Steinort is licensed under a Creative Commons Attribution 4.0 Unported License.
Permissions beyond the scope of this license may be available at https://meetthegimp.org.

Episode 193: A Mondrian UI

193Download the Video! (11:50, 41.3 MB)

Watch on YouTube

After a too long summer break I give you a preview of one feature in the next version of GIMP – the unified transformation tool. It combines the tools for moving, rotating, scaling, shearing and for changing the perspective in one tool with a nice and sleek user interface.

The UI design has been done mostly by Peter Sikking.  He has also had his hands in the nice free selection tool design.

This unified transformation tool shall be used with visual feedback on the canvas. The old tool will stay around for work where numbers are important.  So this is not a replacement but an addition.

You can read a bit more in the developers mailing list and on the GUI wiki page.

The TOC

00:00:00 General rumblings
00:01:20 GIMPMagazine 4
00:02:26 GIMP 2.9
00:02:26 The Transform Tools of 2.8
00:04:00 Loss of sharpness – unavoidable with transformation
00:04:35 The new Unified Transform Tool UI
00:07:50 Better results due to only one calculation
00:09:00 Peter Sikking, UI architect
00:10:20 The UI design determines your work flow
00:10:41 No replacement for the traditional tools
00:11:33 Final words
00:11:50 End of video

Image credits for the Autobahn sign: Wikimedia, User Mediatus.
Creative Commons License
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.