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How to capture hands: camera, palm print or flatbed scanner?

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How to capture hands: camera, palm print or flatbed scanner?

Post  yogiman on Fri Jun 27, 2014 11:28 am

The suggested way to make a handprint is by covering the hand with ink. However, this is inconvenient for the casual case. Would it be possible to create a computer application that converts a photo into a black/white handprint?


Last edited by Martijn (admin) on Sat Aug 30, 2014 3:57 pm; edited 2 times in total (Reason for editing : Title edited)

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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  Martijn (admin) on Fri Jun 27, 2014 4:13 pm

yogiman wrote:The suggested way to make a handprint is by covering the hand with ink. However, this is inconvenient for the casual case. Would it be possible to create a computer application that converts a photo into a black/white handprint?

Hello yogiman,

Sorry, I don't think that such an application will become useful as it will likely induce visual effects that are not really present in the hand. Photoshop does provide options to create such effects but those options will not give you the opportunity to see the path of the ridges lines inside the fingerprints, etc.

A photo-copier will give a detailed 'flat' result, though the quality will e.g vary with the quality of the product.


 wave 

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ink palmprint outdated?

Post  yogiman on Wed Jul 09, 2014 12:05 pm

I have watched the hand photos on this website, and I am impressed by the quality. It makes me wonder what is still the use of an old fashioned handprint.

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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  Martijn (admin) on Wed Jul 09, 2014 5:59 pm

yogiman wrote:I have watched the hand photos on this website, and I am impressed by the quality. It makes me wonder what is still the use of an old fashioned handprint.

Short answer: handprints are basically especially a valuable tool to study the dermatoglyphics.

Thanks for asking!  wave 



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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  yogiman on Sat Aug 30, 2014 9:02 am

The benefit of a photo is that there is no mess, as a consequence less hurdle for a possible subject, easy storage, no need to outline the fingers, and the ability to draw in the picture.
The benefit of an ink print is that the dermatoglyphics are somewhat clearer, and that the subject has to go through some ritual before the act of handreading.

Weighing both photography in the present modern time and ink print, which one is preferrable?

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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  Martijn (admin) on Sat Aug 30, 2014 10:31 am

yogiman wrote:The benefit of a photo is that there is no mess, as a consequence less hurdle for a possible subject, easy storage, no need to outline the fingers, and the ability to draw in the picture.
The benefit of an ink print is that the dermatoglyphics are somewhat clearer, and that the subject has to go through some ritual before the act of handreading.

Weighing both photography in the present modern time and ink print, which one is preferrable?

Hi yogiman,

I think a hand scan (photocopy in color) is most preferable, since it usually gives a good impression of nearly all essential (visible) features, including the dermatoglyphics. The example below illustrates the quality material which one can achieve using a hand scan.

Click HERE to see the details.

wave



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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  yogiman on Sat Aug 30, 2014 3:09 pm

Sorry for my previous deleted post. After clicking full size I indeed see the details. What type of handscanner is recommended?

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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  Martijn (admin) on Sat Aug 30, 2014 3:32 pm

yogiman wrote:Sorry for my previous deleted post. After clicking full size I indeed see the details. What type of handscanner is recommended?

By principle you can use any flatbed scanner that is appropriate to make copies of books; but be aware that the very cheapest scanners might get damaged due to the weight of the hands, so I would recommend to use a robust product that can take a very heavy book.

These are the type of products that you can use:


Flatbed Scanners


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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  yogiman on Sat Aug 30, 2014 10:49 pm

Thank you Martijn for your always honest and useful replies.

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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  Lynn on Sat Aug 30, 2014 10:57 pm

The scan example from Martijn for sure gives a very clear picture and ability to see all the skin ridges & fingerprints. This is not the case with some of the hand scans that people send me. Are there any further clues as to how to get a good hand scan? What resolution should they be scanning at? Most scans I receive have the mounts and fingerprints squashed flat (due to pressing down too hard on scanner) the lifeline appearing wider than it really is (due to thumb being held too close to hand) etc. So far I didn't find scans to be the clearest representation of the hands.

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Re: How to capture hands: camera, palm print or flatbed scanner?

Post  Martijn (admin) on Sun Aug 31, 2014 11:43 am

Lynn wrote:The scan example from Martijn for sure gives a very clear picture and ability to see all the skin ridges & fingerprints. This is not the case with some of the hand scans that people send me. Are there any further clues as to how to get a good hand scan? What resolution should they be scanning at? Most scans I receive have the mounts and fingerprints squashed flat (due to pressing down too hard on scanner) the lifeline appearing wider than it really is (due to thumb being held too close to hand) etc. So far I didn't find scans to be the clearest representation of the hands.

Great question Lynn!

10 Years ago the FBI described 250 to 300 dpi scan as probably the minimum resolution in their fingerprint scanners; so, that should do as well for a full hand scan.

(Today is 500 dpi is generally recognized to represent a medium resolution for scanners)

PS. Additionally, I think it would be okay to ask for real size pictures in jpeg format for each hand separately that take between 0.5 to 1.0 mb memory storage.



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