Tcpdf, the coordinates of the problem

Tcpdf, the coordinates of the problem.
Finally convinced oneself or a output bar, don't turn, but


$pdf->image ('./images/invoice/oxford-summer-school-logo.gif ', ', ', ', ', ', ' gif ');


HTML page slice is marginp-top:38px margin-left:40px


But written in the tcpdf, measured a little more than 100 px has become the distance.


No, how accurate??

------Solution--------------------
Instantiation Tcpdf Do you have a unit of measurement from time to time? The default is mm, which should be PT for your example

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