[Kde-imaging] [Bug 253876] New: Saving scanned grayscale image fails for some formats (png, tif)

[Johannes Midgren]

https://bugs.kde.org/show_bug.cgi?id=253876

           Summary: Saving scanned grayscale image fails for some formats
                    (png, tif)
           Product: kipiplugins
           Version: 1.4.0
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: AcquireImages
        AssignedTo: kde-imaging at kde.org
        ReportedBy: johannes at midgren.net


Created an attachment (id=52422)
 --> (http://bugs.kde.org/attachment.cgi?id=52422)
Image scanned using Gray scan mode, 8 bit/pixel, 300dpi - saved in png format

Version:           1.4.0 (using KDE 4.5.1) 
OS:                Linux

Opening an image acquired with AcquireImage using "Gray" scan mode shows an
image of correct size but with transparent pixels only. 

This happens for (at least) png and tif image file formats.
jpeg and xpm have also been tested and works fine. 

Reproducible: Always

Steps to Reproduce:
* Open AcquireImages
* Set "Scan mode" to "Gray" (resolution does not seem to matter)
(* Preview and select scan area)
* Scan
* Save the image in png or tif format

Actual Results:  
* Try to open the saved image using e.g. gwenview or gimp
* The image file is opened but shown as sole background (all pixels seem to be
transparent)

Expected Results:  
* The grayscale image is shown similar to the one in the preview window of
AcquireImage

OS: Linux (i686) release 2.6.32-24-generic
Compiler: cc


Scanning in "Color" mode works fine with the same scanner and image formats as
listed above.

Some other image file formats work fine, e.g. jpeg and xpm (both color and gray
scan modes)

Scanner used: "Canon CanoScan N 650U"

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