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Resizing scanned image

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#1 Anonymous1234


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Posted 13 January 2016 - 10:33 AM

Hello everyone,

Appreciate the forum. I have a 17"x24" charcoal artwork piece that I'm trying to use as a beer label. So, I started by scanning the image in color at 600dpi. I sent it to the label printing company, and they said it was too big, and when it was resized the resolution was too low. They told me to resize it on my end and send it again.

My question is, is there a difference between using something like photoshop to resize the original, large scan to something smaller, and actually rescanning the image at 600dpi while setting the scanner to produce a smaller image as it scans? The labeling company said there is a difference, but I don't understand why. I also don't want to spend the money rescanning it if I can avoid it. Can I just resize it in Photoshop, or does that destroy the resolution? And if it I can't just resize it, how do I get I high resolution 2.5"x3.5" photo with a 17"x24" original? Any help would be great!!

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#2 Chris Cosgrove

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Posted 14 January 2016 - 07:30 PM

That is some size of image !  A quick crank of the calculator says that is 10,200 x  14,400 pixcels scanning it at 600 dpi. I gather you want to reduce it to 2.5 x 3.5". Has the brewery company told you what resolution they print their labels at, this is a fairly basic piece of  information ?


If they print at 300dpi, equivalent roughly to images in a glossy magazine, the required image size would be 750 x 1050 pixcels; if they print at a more likely 100dpi, then the image would be 250 x 350 pixcels.


Once you have established what size of image they want, in terms of pixcels or dpi, then, yes, just use the 'Image size' tools in Photoshop (or equivalent) to reduce the size of of your large image to the size they want and see what it looks like.


If you have a flatbed scanner of your own of A4 size or your local equivalent, you could try scanning this image in probably four pieces and then stitching the images back together. This can be very successful if you are careful and is much cheaper than going to an outside shop with an A3 scanner. You can then try scanning at different resolutions to see what the final effect is, and which looks best.


Chris Cosgrove

I am going to be away until about the 22nd October. Time on-line will be reduced and my internet access may be limited. PMs may not be replied to as quickly as normal !

#3 vertexx


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Posted 28 January 2016 - 07:15 PM

A nice clear answer, Chris.

Similar situation to mine except I used pixels per inch.

I took a 1200x900 render to a print shop and asked for a 300 ppi print.

Amazed that they asked what size I wanted the print to be!!!

Luckily the manager was about and managed a laugh.

At least he knew that at 300 ppi the size of the print must be 4x3 inches.

But the staff were quite ignorant.

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