XnView Software

1. Using XNViewMP 0.72 x64 (Dec 19 2014) on Windows10.
2. After 90-degree rotation, CCITT G4 compression B&W TIFF image changed to LZW compression.
3. How can I get CCITT G4 compression TIFF image after rotation ?
When I use XNView (not MP), this issue does not happen.

4. [File] > [Format settings] > [Write] > [TIFF] settings are below:
Compression for black&white picture --> CCITT G4
Compression for color picture --> LZW
All checkbox --> off

Regards,

It seems that XNViewMP apply "Compression for color picture" setting to B&W image.

[File] > [Format settings] > [Write] > [TIFF] settings:

Compression for black&white picture --> CCITT G4
Compression for color picture --> LZW
--> B&W image after rotation --> LZW

Compression for black&white picture --> CCITT G4
Compression for color picture --> No Compression
--> B&W image after rotation --> No Compression
Compression for black&white picture --> CCITT G4
Compression for color picture --> Packbits
--> B&W image after rotation --> packbits

See Issue 725 for current status and details.

xnview wrote:See Issue 725 for current status and details.

Thank you Pierre.

This problem is supposed to be fixed in XnView MP 0.76 or later. Could you please try and confirm the bug fix, arxiv?

helmut wrote:This problem is supposed to be fixed in XnView MP 0.76 or later. Could you please try and confirm the bug fix, arxiv?

I don't think it is fixed yet, I've seen apparent anomalies in file size and compression method more than once recently...

Testing now:

1. Open the attached 1-bit file;

2. Set File > Format settings... > Write tab > TIFF :

Compression black and white -- CCITT G4 and Compression colour -- LZW

Result: file is saved with LZW compression, not CCITT G4

Setting:

Compression black and white -- CCITT G4 ; Compression colour = JPEG

Result is compression CCITT G3 !!

Something does seem mixed up! (Other colour compression options not tested.)

I can confirm your observations, cday.

Reproduced.

O.k., thank you, I can also reproduce the problem. Issue 1149 is fixed in next version.

This problem is supposed to be fixed in XnView MP 0.85 beta 1. Please check and confirm the bug fix here.

Confirmed fixed in 0.85 beta 1 64bits.

cday wrote:Confirmed fixed in 0.85 beta 1 64bits.

Thank you for checking this, cday. Before moving this to "Tested - Fixed" I'll wait for the feedback of the original poster (arxiv).

Thank, I tested 0.85b1(64bit) and found this isssue had been fixed.

arxiv wrote:Thank, I tested 0.85b1(64bit) and found this isssue had been fixed.

Good. Thank you for checking and reporting back, arxiv!