hugin-devs team mailing list archive

[Yuv <779563@xxxxxxxxxxxxxxxxxx>]

On May 8, 2011 04:29:43 PM Bruno Postle wrote:
> In your testcase _MG_7851_hq.JPG really is grayscale and the other two
> are RGB, so the error message is correct.

*blush*. I thought there was no such thing as grayscale with jpeg
compression.

 
> Were these images processed by ImageMagick?

yes, ImageMagick is the culprit in the chain.  And this same image that caused 
what i mistakenly reported to bug 717944, and that crashes both cpfind and 
panomatic.  I'll do some more investigations and file a report on those 
crashes later.


> This is one of the
> annoyances of ImageMagick, it will collapse the data to a different
> format if it thinks it can save space - I have never been able to turn
> this behaviour off.


I found that with PNG it can be forced with something like PNG32:output.png 
but have not used it yet, and in this case I was using JPEG.

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https://bugs.launchpad.net/bugs/779563

Title:
  enfuse sees a "grayscale" image where there is not

Status in Enblend:
  New

Bug description:
  I am processing three exposures of a large panorama.  This is in the
  area where the scene is brightest and so the highest exposure is
  completely white.  When blindly fusing each stack, the stacks with the
  white images return the error message:

  $ enfuse --contrast-weight=1 --output=_MG_7849_hq-_MG_7851_hq.jpg _MG_7849_hq.JPG _MG_7850_hq.JPG _MG_7851_hq.JPG
  enfuse: info: input image "_MG_7849_hq.JPG" does not have an alpha channel;
  enfuse: info: assuming all pixels should contribute to the final image
  enfuse: info: input image "_MG_7850_hq.JPG" does not have an alpha channel;
  enfuse: info: assuming all pixels should contribute to the final image
  enfuse: info: input image "_MG_7851_hq.JPG" does not have an alpha channel;
  enfuse: info: assuming all pixels should contribute to the final image
  enfuse: input image "_MG_7851_hq.JPG" is grayscale
  enfuse:   but previous images are color

  expected behavior: fuse the images (and let the weightings take care
  of the over exposure)