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 Replies: 14 / Views: 1,328 |
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Pillar Of The Community
Australia
2156 Posts |
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I've noticed that some people are able to process images in a way that allows the postmark to be viewed more clearly.* Is anyone able to share the secret? I just use the image processor that comes with my Mac, but I haven't been able to create similar images. * Example taken from Stampboards:  |
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| Edited by jimjamtwo - 10/02/2020 01:09 am |
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Valued Member
Australia
156 Posts |
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You should have asked the person posting it on Stampboards.
Regards
Frank |
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Pillar Of The Community
Australia
2156 Posts |
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I'm not a member. A lot of people use this technique and I've seen examples on this site too. |
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Pillar Of The Community
United States
1096 Posts |
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Pillar Of The Community
Australia
1209 Posts |
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Pillar Of The Community
Australia
2156 Posts |
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Thanks, I tried it once but the results weren't great. That said, the example given here was apparently done at Retroreveal because that's part of the file name. I'll try again tonight. |
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Pillar Of The Community
Australia
2156 Posts |
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Moderator
United States
12330 Posts |
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Pillar Of The Community
Australia
2156 Posts |
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OK, figured it out and got a great result. The cancel seems more or less legible now, perhaps 1970 (if the last digit is a 0).  |
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| Edited by jimjamtwo - 10/02/2020 03:51 am |
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Pillar Of The Community
United Kingdom
568 Posts |
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I am glad it worked. I know nothing about Macs but on windows and photoshop if you convert an image to B&W you can then play with the individual colour channels to, for example, reduce the red part of the image and enhance the blue which would show up a blue / black cancel on a red stamp. It may work with what you have without having to use a web site.
AQ |
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Pillar Of The Community
United States
2941 Posts |
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I wrote a small app called PMGS Reveal that does something similar. You can download it for free here. |
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Valued Member
United States
466 Posts |
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You can use edge-detecting or color contrast filters in image processing software like GIMP (free) or Photoshop (not free) as well.
Scan the back of the stamp, and you can detect hard-to-see watermarks this way, too. |
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Pillar Of The Community
Australia
975 Posts |
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Pillar Of The Community
Australia
2156 Posts |
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Valued Member
United States
61 Posts |
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Thanks for this thread!!! I used retroreveal years ago and I seem to remember that it had stopped working or the site went down. Glad to see from this thread we are able to use it again. I just used it to try and work on a few postmarks that are tough to decipher and it usually gives at least a better idea of what we are looking at. |
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Replies: 14 / Views: 1,328 |
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Posted 10/02/2020 01:08 am
