How to size your scanned card images for ebay.
Extracting the multiple cards from a scan is easy...
... but one customer sent me some very specific questions about how to get the size of sports card scans destined for ebay correct. So I thought my reply to him would be useful to others.
This is what says:
"Try to use a photo that is at least 1600 pixels on the longest side. This will give you a better result. However, we recommend you don't enlarge smaller images to make them 1600 pixels. The photos you use must be at least 500 pixels on the longest side."
RansenScan V4 has a command to show pixel sizes. So you can simply change the DPI until you get the right size of ebay. To see the actual pixel sizes of the extracted images by using the Tools menu Show Pixel Sizes ON/OFF option:
What ebay actually says is a bit confusing, what they really mean is that any photos you use should have at least 500 pixels along the longest side, and ideally 1600 pixels along the longest side.
Also, if you have a small photo, enlarging it will only give you a bigger but blurrier photo. Your original scan or photo should be more than 500 pixels, and ideally 1600 pixels.
My customer said:
Therefore, I need your assistance to ensure that my scan is at least 500 pixels on the longest side.
Single cards measure:
Graded Single cards measure:
For ebay I use 300 DPI (an industry standard scanning resolution) so the first step is to set RansenScan to 300 DPI, like this:
Now, if Single Cards are 3.5 inches along their longest side, 300 DPI (Dots per Inch) will give you 3.5 x 300 = 1050 pixels, which is perfect, halfway between the minumum and "ideal" image size for .
And if Graded Single Cards are 5.125 inches along their longest side, 300 DPI will give you 300 x 5.125 = 1537 pixels. This time you are practically at the "ideal" ebay size.
So setting the DPI to 300 in RansenScan settings covers both Single Cards and Graded Single Cards.
Also remember to enable Automatic Extraction Of Images as shown in the screenshot above. Normally the default settings are fine.
But if you want to be even more precise... of the two sorts of cards, the minimum length is 2.75 inches. And the maximum of the two sorts of cards is 5.125 inches. So you could set the auto extraction dialog to look like this (on my scanner):
So move the sliders until you get a minimum of about 2" and a maximum of about 6". Again I emphasise that usually it is best to set to the default settings if they work with your size of sports /cigarette cards.
By the way, remember to keep the objects away from each other, RansenScan needs some space between cards to be able to automatically separate them, as shown above.
RansenScan has a Windows demo you can download and try for yourself: