| T O P I C R E V I E W |
| tcardinal |
Posted - Feb 10 2012 : 17:57:25
How is dpi used in ImageEN? I know dpi is a printing measure and obviously doesn't relate to the actual quality of the image but how big you print it, but a client is hung up on this. I have an image created out of an A1 sized pdf which is at 72dpi. I need to resize it to A4 and retain the 72dpi. I resize it to 595 x 842 pixels (which apparently is A4 at 72 dpi) but when I look at the params it is 300dpi. Thansk for any pointers |
| 1 L A T E S T R E P L I E S (Newest First) |
| fab |
Posted - Feb 11 2012 : 06:12:38
A1 (23.4 × 33.1 inches) at 72dpi corresponds to an image of 23.4*72 x 33.1*72 = 1684 x 2383 pixels
A4 (8.3 × 11.7 inches) at 72dpi corresponds to an image of 8.3*72 x 11.7*72 = 597 x 842 pixels
So, yes, you have to resize the image to 597 x 842 with:
ImageEnView.Proc.Resample(597, 842, rfTriangle);
Now you have to change DPI info, with:
ImageEnView.IO.Params.Dpi := 72;
Finally you can save the image (choose a format that supports DPI tags):
ImageEnView.IO.SaveToFile('output.jpg');
Hope this helps. |
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