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The pixel size of the file is 3.264 × 4.928.
Does the same problem happen for files with a similar (or even larger) size?

*** This bug has been marked as a duplicate of bug 32387 ***

@Andre - Thank you for your answer. It's the right Question :-)

Meanwhile I found the solution.

$wgMaxImageArea = 1.25e7; is too small.

My first Solution:
LocalSettings.php:
 $wgMaxImageArea = $wgMaxImageArea * 100 


Background File: Bitmap.php:

Til 18.4 (incl.):

		if ( $mimeType !== 'image/jpeg' &&
			$srcWidth * $srcHeight > $wgMaxImageArea )
		{
			return false;
		} 


Since 19.0:

			if ( $srcWidth * $srcHeight > $wgMaxImageArea &&
					!( $image->getMimeType() == 'image/jpeg' &&
						self::getScalerType( false, false ) == 'im' ) ) {
				# Only ImageMagick can efficiently downsize jpg images without loading
				# the entire file in memory
				return false;
                  }