So you have to work it the other way - for the given density figure out what the pixel dimensions will need to be to achieve the given 8.26 inches by 11.69 inches If you want smaller pixel dimensions than in your original image, you can resize and then do the same computations, but if you get too small pixel dimension, then you will lose quality and image will look blocky.Īlternately, you can resize your images (cropping or padding) so that you can use a nominal density (say 150 or 300) for printing. So you may need to either crop or pad your image appropriately. To keep aspect ratio, you should not have -density XXxYY with different XX and YY. Then just set the density of the images.Ĭonvert image -density XX -units pixelsperinch result So what you want to do is find the image size (without resizing) and compute what density you need to achieve these printed sizes in inches. That seems to closely match which say 8.27 × 11.69 Thus if you divide pixels dimensions x 72dpi you get 8.26 inches by 11.69 inches. s.php#page, A4 has a pixel dimension of 595x842 presumably at 72 dpi. So to keep the printed size the same you need to make sure that when you combine the pixel dimension with the density (resolution in inches or centimeters) so that it matches the physical printed size of the A4.Īccording to. The latter depends upon the pixel dimensions and the density.
FOTOMAGICO PIXEL DEMENSION HOW TO
I'm wondering maybe I need to use some kind of *density* knobs, but no idea how to achieve this goal.įirst you have to understand that pixel dimensions don't equate to printed size. I know it's easy for IM to convert between different format, resize, sample, and so on.īut whenever I *resize* a large picture to smaller size, it looks not as clear as the orignal ones, I guess I lost the resolutoin here.
FOTOMAGICO PIXEL DEMENSION PDF
So the whole purpose is, this way, later on I can merge them into a a pdf book with each page has the same size, and to make hardcopies. * for smaller image, I don't mind if they are expanded and lose some resolutions * while at the same time, for bigger images only, don't lose resolutions * make sure they can be printed to exactly (or at least roughly) the same physical size (A4), I want to re-format ALL of my pictures, and * I also have some other pictures that was taken by camrols.
* sometime I scan with input size A3 (for large pictures), or A4 * when I scan them, I set different DPIs, sometime 200 I have scanned a lot of picutures/photos (totally around 800), the complexities here are : I'm reading a lot, but so far I couldn't find a good way to do what I wanted. I've been learning IM for a while, its amazingly powerful.
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