AWARE [SYSTEMS]
AWare Systems, , Home TIFF and LibTiff Mailing List Archive

LibTiff Mailing List

TIFF and LibTiff Mailing List Archive
January 2015

Previous Thread
Next Thread

Previous by Thread
Next by Thread

Previous by Date
Next by Date

Contact

The TIFF Mailing List Homepage
Archive maintained by AWare Systems



New Datamatrix section



Valid HTML 4.01!



2015.01.09 03:55 "Re: Libtiff JPEG sampling factors error should be warning", by Lee Howard

I would agree that in a situation like that - where the image can be 
read - a warning (rather than an error) is appropriate.

Thanks,

Lee.


On 01/08/2015 07:21 PM, Bob Friesenhahn wrote:
> I received this [somewhat edited] email off-list.  Is the consensus 
> that libtiff should issue a warning rather than an error for this case 
> (like libjpeg apparently does) so that the image still can be read?
>
> """
> This image has a problem reading using libtiff 
> "https://app.box.com/s/8lfqekv98dc615ezrld6". This image
> fails with the following message: Improper JPEG sampling factors 2,2. 
> This error is raised on line 1104 of tif_jpeg.c (I
> used this file for the line number: 
> https://github.com/vadz/libtiff/blob/master/libtiff/tif_jpeg.c 
> [github.com]). When I
> change the code to only raise a warning when the sampling factor is 
> incorrect it will create a correct image. I noticed
> that libjpeg will also raise a warning if the data is incorrect. I got 
> this when I changed the h_samp_factor values. Is
> changing the error to a warning a correct patch or do you know a 
> better way to solve this? Or should this image be
> threated as corrupt?"""
>
> Bob
>
>
> _______________________________________________
> Tiff mailing list: Tiff@lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/tiff
> http://www.remotesensing.org/libtiff/