getImageMatrix
Get an image matrix.
getImageMatrix([in] int idx, [out] double *m0, [out] double *m1, [out] double *m2,
[out] double *m3, [out] double *m4, [out] double *m5)
This function returns the image matrix for
the
idxth image on the page specified in the
last call to getImages.
The returned matrix is the PDF/PostScript-style matrix used to transform a 1x1 square to the target region where the image will be drawn. This information can be used to derive the horizontal and vertical image resolution (assuming a straight rotation with no shearing) - see the example code below.
VB:
Dim m0 As Double, m1 As Double, m2 As Double
Dim m3 As Double, m4 As Double, m5 As Double
Dim hRes As Double, vRes As Double
pdf.getImages(1)
nImgs = pdf.numImages
For i = 0 To nImgs-1
pdf.getImageMatrix(i, m0, m1, m2, m3, m4, m5)
hRes = (w / Sqr(m0 * m0 + m1 * m1)) * 72
vRes = (h / Sqr(m2 * m2 + m3 * m3)) * 72
MsgBox("image " & i & ": " & hRes & " x " & vRes & " pixels per inch")
Next i