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Topic: Transfomation matrix question
Conf: (P-PDF) Developers, Msg: 107844
From: CF
Date: 3/18/2004 08:00 AM

I am reading the image info from the Image Xobject as well as from the content stream in an attemp to find the image size.  Does anyone know why I am getting a transformation matrix that looks like this every now and again....


q
0 -313.894 1.5 0 207.28 330.7239 cm
/Im10 Do
Q

Correct me if I am wrong, but aren't the elements of the tranformation matrix...1 = x scale, 2 = skew and rotation, 3 = skew and rotation, 4 = y scale, 5 = x translation, 6 = y translation?

Is the tm showing this way because more than one transformation matrixes have been combined?  If so, how can I determine what the actual x and y scale values are, since they can't actually be 0, can they?


Or is the tm showing up this way because the image was possibly rotated or something?


What I am trying to accomplish is to determine the image resolution, by taking the width and height of the actual image, from the Image XObject, and then determining the rastorized width and height from the content stream, and cm.  Calculating the image size in inches and then calculating the resolution.  But when I get a matrix with elements 1 and 4 eqaul to 0, of course the calculations do not work.


Any help is greatly appreciated!


Thanks in advance,
Chris



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