Thumbnails for Corel files are wrong

[m.Th.]

The thumbnails for Corel Draw and Corel Photo-Paint are wrong.

It seems that for both programs XnView MP uses the 1st thumbnail which generates for all other files.

XnView MP screenshot:

Explorer screenshot:

Corel-Explorer.jpg (37.45 KiB) Viewed 2154 times

Also rescale/resample the thumbs in order to show them at the dimensions of XnView's thumbnail.

[xnview]

On XnView classic, do you have same thing?

[m.Th.]

On XnView classic, do you have same thing?

No, but Xnview Classic crashed when it entered in that folder. Do you want the samples?

[xnview]

I don't read corel thumbnail so i think that shell extension from corel is used here
But you can send me some samples to be sure?

[m.Th.]

I don't read corel thumbnail so i think that shell extension from corel is used here
But you can send me some samples to be sure?

Samples sent. Do you want the corresponding BMP/PNGs to see what it should look?

[m.Th.]

In fact, Corel files are just RIFF files: http://en.wikipedia.org/wiki/Resource_I ... ile_Format

The code to read them is here:

http://sourceforge.net/projects/uniconvertor/

A part of UniConvertor is CDR explorer which reads the file:

http://sk1project.org/modules.php?name= ... drexplorer

See it in action at:

http://sk1project.org/images/index/sword.png

We need just the DISP chunk - see here:
http://sk1project.org/content/others/images/pict010.png

[XnTriq]

The “CDRCvrsn” string indicates that these are actually CorelDRAW files.

The RIFF (Resource interchange file format) format was created by Microsoft and is used by many applications like Windows, Corel Draw etc.. It is block structured, each block has a header ID and a size, so that even a program that works with an old version of the file format can skip the unknown parts of the file and work on the known parts of the file. All RIFF blocks begin on a word boundary so it might be necessary to skip an additional byte. In the present specification, only one RIFF block per file is allowed, and only the RIFF and LIST blocks may contain subblocks.

You'll find a “RIFF” signature in the headers of .ANI (Animated Cursor), .AVI (Video for Windows), .PAL (Microsoft Palette), .WAV (Wave Form), but also .CDR (CorelDRAW), .CLK (Corel R.A.V.E.) and .CMX (Corel Presentation Exchange) files, if you view them in hex mode.

Related threads on this forum:

• ouvrir des fichier coreldraw
• CorelDraw cdr files
• Problem opening .CDR files...
• how can i open a cdr file?

In 2007 the sK1 team reverse-engineered the CDR format. The results and the first working snapshot of CDR importer were presented at Libre Graphics Meeting 2007 conference taking place in May 2007 in Montreal (Canada). Later on the team parsed the structure of other Corel formats with the help of CDR Explorer. Now sK1 has the best importer of CorelDRAW file formats among open source software.

CDR Explorer is a research tool for CorelDraw file formats. It was used to create a CDR import filter for sK1 Editor and UniConvertor. This tool is written on Python and works under Linux, MacOS X and Win32. Preview works for all types of cdr, cdrx, cdt and cmx files.

SourceForge.net SCM Repository: UniConvertor » /formats/CDR/cdr_explorer/src/

• Handling limited Corel format support