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In ACR, underneath the image, there is a hyperlink to workflow options and in that window you can check or un-check "resize to fit" and also you can check/uncheck "don't enlarge"I've also read that you can use the crop tool but I don't see how to do thatI'm using the latest version (12) via the cc subscriptionthanks
Open the image in Photoshop, then duplicate it (Image > Duplicate), to avoid accidentally overwriting the original.
Display the rulers, Ctrl+R (Windows), Cmd+R (Mac).
Right click the ruler, and choose your preferred unit of measurements. (cm or inches)
Go to Image > Image size, and the image will most likely have wrong dimensions if it comes directly from a scanner or a camera.
The screenshot below shows the Image size dialog for the image I posted previously.
Change the width of the image to 200 cm, or whatever width you want.
The height and resolution will update once you press Tab.
Note that Resample must be unchecked.
With the crop tool, click and drag the area that you want to use for a test print.
Dimensions will show as a tooltip as you drag, and you want an area that is a little smaller than the max paper size of your printer. Press Enter to commit the crop, then print it.
But I wouldn't bother with a drum scan with a low quality original.
Imacon/Hasselblad scan will be fine, or a Nikon LS 5000, although the latter only scans at 4000 ppi.
And as I mentioned before, I would not enlarge the scan/image from camera, again because of the quality of the original.
But if you have a desktop inkjet printer, you can do some experiments with a small section of the image, using different processing techniques, and see for yourself what works best.
As for paper choice, it's possible that a textured paper will be better, not sure, I always use glossy paper. Do some tests with different papers.
" if you have a desktop inkjet printer, you can do some experiments with a small section of the image, using different processing techniques"
How ? Once I have the enlarged file, crop a small section (with a paper ratio like 6x4 or 5x7 or 8x10) & check under Image Size that it'll fit my pper (or keep cropping smaller until it does ?
Thanks so much for the help