JPEG 2000 (+25)

I am still wrapping my head around #jpeg2000...

It looks like #Gimp 3 removed the exporting support for it...

I can still use #imagemagick to trigger the conversion from any source to jpeg2000 to PDF.

But fewer steps are better...

I just updated my #MSDOS image viewer/converter #DosView

* Updated libjpeg to 9f.
* Updated libjasper to 4.2.4.
* Fixed a crash when running out of memory during loading/display.
* Fixed version number when running DosView.
* Added help overlay in view mode.
* Patched Allegro to support more BMP formats.
* Fixed DE LSM for FreeDOS.

https://github.com/SuperIlu/DosView/releases/tag/v1.7

#RetroComputing
#jpeg #png #qoi #webp #bmp #tga #NetPBM #ras #tiff #jpeg2000 #pcx #FreeDOS #GIF #PSD #HDR #PIC

I just updated my #MSDOS image viewer/converter #DosView

* added #FreeDOS compatible package

https://github.com/SuperIlu/DosView/releases/tag/v1.6

#RetroComputing
#jpeg #png #qoi #webp #bmp #tga #NetPBM #ras #tiff #jpeg2000 #pcx #FreeDOS #GIF #PSD #HDR #PIC

Google security researchers found vulnerabilities in the #Kakadu #JPEG2000 library, then used "Conditional Corruption" technique in server-side exploit that hijacks control flow and executes arbitrary code:

https://bughunters.google.com/blog/6220757425586176/cvr-the-mines-of-kakad-m

So I just found out that Safari killed JPEG 2000 support

Granted they were the only browser to natively support it, but still such a shame when a better standard can't compete with the older, lesser one

Hi #digipres colleagues interested in #digitization in #jpeg2000 !

My question: do you use compression ratio or PSNR to define the JP2 compression?

I don't know if it's useful to create a poll for that, but if you think so, I can do it...

I remember when shiny new JPEG 2000 was going to replace the legacy JPEG format... It didn't happen and on the web only Safari ever supported it https://caniuse.com/jpeg2000
... until now https://webkit.org/blog/15443/news-from-wwdc24-webkit-in-safari-18-beta/:
"WebKit for Safari 18 beta removes support for the JPEG2000 image format. Safari was the only browser to ever provide support."
It's pretty rare to remove support for a format on the web.
#WebPerf #jpeg2000

fq master now has some basic jpeg2000 support if someone wants to poke around. help out or let me know what to improve.

New bugfix release of #Jpylyzer is out now! #jpeg2000

Version 2.2.1 fixes a check on the number of tileparts, which got broken at some point.

It also fixes an "unknown error" that was reported in case of a missing or malformed Bits Per Component Box.

More details + download links here:

https://jpylyzer.openpreservation.org/2024/04/08/jpylyzer-2-2-1

TIL: JPEG-2000 uses the same container than MPEG-4, which is basically the son of QuickTime. Which means when it is actually embedded inside a QuickTime stream, there seems to a magical 8 byte prefix, which needs to be stripped to get a valid JPEG-2000 file. Long story short, my QuickDraw viewer should now handle JPEG-2000 data embedded inside QuickTime containers.

#quickdraw #quicktime #jpeg2000 #imageprocessing #retrocomputing #classicmac

https://github.com/wiesmann/QuickDrawViewer

So there's a new (2.5.1) #OpenJPEG release #jpeg2000:

https://github.com/uclouvain/openjpeg/releases/tag/v2.5.1

I ported the plugins from #DosView to #DOjS, so the next release of #DOjS will contain #TIFF, Sun Raster and #Jpeg2000 loading/writing.

I also switched #JPEG libraries and #JPG saving will be possible, too.

I also added a more sophisticated way of detecting keypresses, so creating games with keyboard input will be easier.

The first stable release of #Jpylyzer 2.2 is out now!

Main new feature is the support for High Throughput #JPEG2000 (#HTJ2K), and its JPH file format.

Also lots of other fixes and improvements, as well as some API and output enhancements:

https://jpylyzer.openpreservation.org/2024/01/23/jpylyzer-2-2-release

In other news, the production version of #jpylyzer 2.2 will finally be out this Wednesday. For those who can't wait, I (more or less by accident!) already uploaded it to the Python package index today #jpeg2000 #HTJ2K

Just a reminder for who missed this earlier: a few weeks ago we published a release candidate for #jpylyzer 2.2, which is available for testing.

This release adds support of High Throughput #JPEG2000 #HTJ2K and its associated file formats, various codestream validation/parsing improvements, some output enhancements (including reporting of warnings), and an improved Python API.

Details here:

https://jpylyzer.openpreservation.org/2023/11/07/jpylyzer-2-2-release-candidate

Please let us know any issues, so we can fix them for the stable release!

I just updated my #MSDOS image viewer/converter #DosView

* Fixed Allegro VESA driver
* Added screen mode autodetection

https://github.com/SuperIlu/DosView/releases/tag/v1.5

#RetroComputing
#jpeg #png #qoi #webp #bmp #tga #NetPBM #ras #tiff #jpeg2000 #pcx #FreeDOS #GIF #PSD #HDR #PIC

I just updated my #MSDOS image viewer/converter #DosView

* fixed zooming bug
* added more screen modes

https://github.com/SuperIlu/DosView/releases/tag/v1.4

#RetroComputing
#jpeg #png #qoi #webp #bmp #tga #NetPBM #ras #tiff #jpeg2000 #pcx #FreeDOS #GIF #PSD #HDR #PIC

I just updated my #MSDOS image viewer/converter #DosView

* added #GIF
* added #PSD
* added #HDR
* added #PIC
* added an UPX compressed EXE
* enabled dithering
* added 8bpp display mode
* fixed another scaling error
* fixed error when reading certain PNGs

https://github.com/SuperIlu/DosView/releases/tag/v1.3.1

#RetroComputing
#jpeg #png #qoi #webp #bmp #tga #NetPBM #ras #tiff #jpeg2000 #pcx #FreeDOS

The release candidate for #Jpylyzer 2.2 is out now! This is a truly action-packed release. Among other things, it adds support for High Throughput #JPEG2000 #HTJ2K. More info here:

https://jpylyzer.openpreservation.org/2023/11/07/jpylyzer-2-2-release-candidate

@general