Author Topic: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI  (Read 1890 times)

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Offline Y7ASyxC

I'd welcome comments in this thread to find out the best settings to use when scanning coins, another test should be done with a NGC slab as well..

Settings and filesize are above each image
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #1 on: 2017 Jan 06, 05:12:51 PM »
1200 DPI, no filters, 436KB
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #2 on: 2017 Jan 06, 05:14:32 PM »
1200 DPI, Unsharpen Mask medium, 575KB
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #3 on: 2017 Jan 06, 05:15:41 PM »
1200 DPI, Backlight Correction medium, 425KB
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #4 on: 2017 Jan 06, 05:16:33 PM »
1200 DPI, Dust Removal medium, 430KB
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #5 on: 2017 Jan 06, 05:17:36 PM »
1200 DPI, Unsharp Mask medium, Dust Removal medium, 566KB
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #6 on: 2017 Jan 06, 05:18:23 PM »
1200 DPI, Unsharp Mask high, Dust Removal high, 638KB
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #7 on: 2017 Jan 06, 05:19:29 PM »
2400 DPI, no filters, 1,230KB
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #8 on: 2017 Jan 06, 05:20:30 PM »
2400 DPI, Unsharp mask high, Dust Removal high, 1,384KB
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #9 on: 2017 Jan 06, 05:46:27 PM »
Badon says this scanner has an optical resolution of 2400 DPI, so i will keep that resolution for now, can't upload a 4800 or higher resolution as of now.

2400 DPI, Slightly darkened Tone Curve, Dust Removal medium
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #10 on: 2017 Jan 06, 09:19:56 PM »
9600 DPI images really look better, but i can't seem to upload them well. I'll try a 4800DPI BMP converted to PNG.

Using FastStone image viewer i can convert 4800DPI BMP's created by scanner software, but it can't read BMP files of 9600 or 12800 DPI. Also i can't upload jpeg images created with scanner software above 2400 DPI to the forum, altough i can open them locally.

Also zoomiing in on a 4800DPI image reveals terrible destruction caused by the dust removal filter, so that's off the table.. Let's try some 4800 DPI in PNG
« Last Edit: 2017 Jan 06, 09:30:50 PM by Y7ASyxC »
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Offline badon

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #11 on: 2017 Jan 06, 09:27:24 PM »
One of your posts was somehow causing the whole topic not to display. I have seen this issue before, and I although I don't know what exactly triggers this bug, it's straightforward to fix it. I just kept splitting posts off of the topic until it displayed again. Then I merged all the posts back into the topic, and left out the one that was troublesome. This post is the one that caused the topic to not display:

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI

I'm going to delete it or put it in "storage" somewhere so we can eventually figure out what caused this bug.
 

Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #12 on: 2017 Jan 06, 09:32:43 PM »
It has something to do with progressive vs. linear jpeg encoding in images produced by the scanner software

What's weird is it also produces BMP images above 9600DPI that even FastStone can't read, but mspaint can.

Edit: tried uploading a 95MB PNG file, no luck.

Edit anything over 2400DPI i try to upload, fails, even if i scan the image in BMP, and then convert to jpg with faststone, it still doesn't work. I can view the images fine locally.
« Last Edit: 2017 Jan 06, 09:41:51 PM by Y7ASyxC »
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #13 on: 2017 Jan 06, 09:53:08 PM »
2400 DPI, Unsharpen Mask low, Backlight Correction low

This seems to be the best i can get, altough i'd prefer 4800 DPI images..
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #14 on: 2017 Jan 06, 09:58:19 PM »
2400 DPI, Unsharpen Mask medium.. Since the coin is not flat against the surface, some kind of sharpness filter seems good..
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #15 on: 2017 Jan 06, 10:04:21 PM »
1899 Nikolai II 10 Rouble
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Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #16 on: 2017 Jan 06, 10:11:08 PM »
I'll continue another day, but unless there is a way to upload higher than 2400DPI, then that resolution with a sharpness filter and some small adjustement of lighting should produce nice enough images. Also the panda is behind the soft pouch, so the image is decent considering that. Slabs should prove interesting to scan, because the coin can be pretty far from the scanner glass..
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Offline badon

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #17 on: 2017 Jan 06, 10:13:08 PM »
I think the problem isn't actually in the forum software, it's in ImageMagick, the software the forum uses to generate thumbnails. If something goes wrong with thumbnails, it can make the page not function.

In any case, the way to push the limits of optical imaging is with superresolution. Use no sharpening or other tricks. You need the raw image files, preferably. Anything that's not original greatly diminishes the amount of resolution increase. The maximum practical resolution upgrade is about 400%. In laboratory conditions it can go higher, but most of the time 150% to 200% is a pretty good result.
 

Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #18 on: 2017 Jan 06, 10:31:22 PM »
same rouble without sharpening. Are you referring to some software?
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Offline badon

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #19 on: 2017 Jan 06, 11:01:51 PM »
same rouble without sharpening. Are you referring to some software?

I don't understand this. Are you talking about 2 different things? Can you rephrase?
 

Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #20 on: 2017 Jan 07, 12:40:01 AM »
same rouble without sharpening. Are you referring to some software?

I don't understand this. Are you talking about 2 different things? Can you rephrase?

I meant superresolution.. If you use any software for that. Anyways, i'll stick to 2400 dpi without any sharpening or other filters for now.. I'll continue another day with scanning some of the coins i have pictures of and comparing which is the better way to go ultimately..
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Offline badon

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #21 on: 2017 Jan 07, 02:21:22 AM »
Superresolution is a technique, and there's only a few software packages out there that can do it. Worse, most of them are for researchers. This is the only one designed for casual use, and it is discontinued:

http://photoacute.com/studio/download.html

You can still download and use trial version to see what super-resolution is capable of. It's fascinating. After I learned about this, I always try to take many photos as fast as possible in case I need to use super-resolution later. It also allows "lucky imaging". Other software I found, but haven't tried yet:

http://mentat.za.net/supreme/

http://www.ece.lsu.edu/ipl/Software.html

This does high quality upsizing that is very impressive. The "super-resolution" it uses is not true super-resolution, but it's free, and it might be useful eventually:

http://reshade.com/

The best thing about super-resolution is the noise reduction. That alone is incredibly valuable for bringing out details that are there, but obscured.
 

Offline badon

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #22 on: 2017 Jan 07, 02:39:01 AM »
I just used PhotoAcute to up-res from 10 megapixels to about 40 megapixels. It's a quick and dirty job using all the wrong settings and a few crappy images that screw up the results, but you can see it's obvious there has been a HUGE improvement in resolution. This 100% authentic actual image data that really exists, but exceeds the capability of the camera itself. Basically, my cheap obsolete camera just captured data that would normally require a $5000 camera system. Amazing.

Super-resolution will work with scanner images also, but the key to making it work is moving the sensor or subject by at least half a pixel's width for each image. Basically, super-resolution digs out all those half-pixels to turn 1 pixel into 4 pixels.  So, you can clearly see that 400% resolution gain is not hard to achieve. Amazing.
 

Offline badon

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #23 on: 2017 Jan 07, 02:42:30 AM »
You can see threads and lint specks that were completely invisible before! Amazing!
 

Offline Y7ASyxC

Re: Flatbed Scanner test - 2017 G500Y from 1200 DPI to 9600 DPI
« Reply #24 on: 2017 Jan 07, 06:53:11 PM »
Very interesting. These are the specs for my scanner:

https://files.support.epson.com/pdf/per258/per258pg.pdf

It says Scanning Resolution: 2400 dpi (main scan), 4800 dpi with Micro Step (sub scan)

My 4800 dpi images look much better than the 2400 dpi scans, but as of yet, i have found no way to upload them. Even if i scan to .BMP and convert to .jpg or even .png. The upload to this forum fails every time.

I can open 4800 dpi images as .BMP or .JPG in mspaint, and i can convert them with FastStone, but i can't upload the resulting images. Images scanned at 9600 or 12800 dpi i can open with windows image viewer, but not with mspaint. I can't convert them with FastStone, and i can't upload them to the forum either.

Anyways, i'll check out the list of software you kindly researched, and try the same trick you did on the violin panda. If nothing else, i should be able to upload the result from an enhanced 2400 dpi image, although running them on a 4800 dpi image will be more interesting. Maybe i'll have to upload the bigger images as .zip files if nothing else.
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