Picture flipped(mirror image) after conversion to Color TIFF - 25035150

[Ganesh_B]

• Hi,
  Please check below columns to understand Image flip issue with attached specific file ‘IMG_0233.jpg’ after conversion to Color TIFF.

• Subject ==> Picture flipped(mirror image) after conversion to Color TIFF - 25035150

• Problem description ==> We have a Customer issue for a specific image ‘IMG_0233.jpg’ file where image is flipped after conversion to Color/Grayscale, 300 or 200 resolution TIFF file using class ‘class MagickPPExport Image’. TIFF file viewed in IrfanView viewer.

• Replicate ==> We can see issue every time when we write code similar as in Code Snippet section below.

• Sample files ==> Attached Customer sample input file ‘IMG_0233.jpg’ and converted file ‘Converted - 2019-06-21T115901.857.tiff’.
  
  ‘IMG_0233.jpg’ - https://drive.google.com/open?id=1ZmTGQ ... qjp84L2wIF
  ‘Converted - 2019-06-21T115901.857.tiff’ - https://drive.google.com/open?id=1HvCtQ ... zXnghf0_pO

• Code Snippets ==>
  Image img;
  img.read(“IMG_0233.jpg”);
  img->density(300x300);//illustrative
  img->quality(50);
  img->resolutionUnits(PixelsPerInchResolution);
  img.compressType(JPEG); //illustrative
  img.type(TrueColour); //illustrative
  img.depth(8);
  img.write(“Converted - 2019-06-21T115901.857.tiff”);

• Component(s) ==> Image Magick Source build

• Support request ==> Please find the root-cause for Image getting flipped or mirror image of original after conversion to Color TIFF file.

Regards
Ganesh.

[Ganesh_B]

• Version ==> ImageMagick 7.0.8-12

• Support request ==> Please find the root-cause for Image getting flipped or mirror image of original after conversion to Color TIFF file.

[246246]

Both your input and output files has Orientation: RightTop (= 6) value.

Code: Select all

$ magick identify -verbose IMG_0233.jpg | grep -i orient
  Orientation: RightTop
    exif:Orientation: 6

$ magick identify -verbose 'Converted - 2019-06-21T115901.857.tiff' | grep -i orient
  Orientation: RightTop

Most viewer support orientation for JPEG but not for Tiff, that is the cause of the problem.
(If you see the files on Windows 7, both are rotated, because Windows 7 does not support orientation even for JPEG.)

So I suggest first rotate and/or flip the image to the stats of orientation = 1 (and set the orientation value to 1 or unset) somehow, then convert.
(From 6 to 1, rotate 90 degree clockwise. See https://magnushoff.com/jpeg-orientation.html for example.)

ImageMagick command line has -orient and -auto-orient option.

-auto-orient should do this work.

[Ganesh_B]

Thanks a lot 246246, for detailed explanation and the info on blog post. It was much helpful.

Regards,
Ganesh.

[Ganesh_B]

Thanks a lot 246246, for detailed explanation and the info on blog post. It was much helpful.

Regards,
Ganesh.