Hi Everybody, I've been playing with my new toy, an Epson 1660 Photo scanner, which works very nicely with Linux. I have noticed that photos that I scan in and then print don't look the same as the original. I am using Xsane, Gimp-Print, and CUPS. If it matters, the photo is 4x6 inches, scanned at 400 DPI, and printed in 1440x720 high quallity mode. The photo was originally printed from my 3 Mpixel digital camera (2160x1440 pixels), so I believe I've used a more than sufficient DPI when scanning. I suspect the problem is that neither the scanner nor the printer is perfect, and that the cumulative effects of the transfer functions (scanner to computer to monitor to computer to printer) are causing this. Its actually worse if I let Xsane compensate for me with its automatic adjustments of gamma, brightness, and contrast. Adjusting the image on my monitor screen probably isn't going to help much since my monitor isn't perfect, nor is there any guarantee that I have it properly adjusted. Is there any good way, other than trial and error, to fix this? Would generating some simple test patterns help in making the proper adjustments? Thanks, Andy -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA USA http://www.wlug.org
On Fri, 27 Dec 2002, Andy Stewart wrote:
Is there any good way, other than trial and error, to fix this? Would generating some simple test patterns help in making the proper adjustments?
Trial and Error is what I've used with linux. Under Microshaft Windowz there are some Calibration tools that have come with my printer that U can use to calibrate the screen with the printer output. I've also had problems when using different types of paper. Ex. the picutre looks ok, using the el cheapo paper. Then i switch to the expensive glossy paper, and the colors look different. Is there any printer color calibration tool for linux out there? Good luck. -- ¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø Karl Hiramoto <karl@hiramoto.org> Work: 978-425-2090 ext 25 Cell: 508-517-4819 Personal web page: http://karl.hiramoto.org/ Freedom: http://www.technojihad.com/ Zoop Productions: http://www.zoop.org/ KTEQ Rapid City: http://www.kteq.org/ AOL IM ID = KarlH420 Yahoo_IM = karl_hiramoto ¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø It does not do to leave a live dragon out of your calculations.
Andy, I do quite a bit of photo work, using Photoshop on the Windows side of things for my art. I've found that each scanner has it's own constant way of skewing the image scanned. For example, on almost every image I scan on my HP 4100C, I first go and drop the Brightness by -10, and up the Contrast by +20 - +25. Since the Gimp is so closely aligned with Photoshop, I'm sure it is not hard to adjust these two characteristics of the image. Play with these to start with. I've seen drastic color improvements and dust/scratch removal just by up-ing the contrast. Maybe if you play with it across a few different images, you can find a few constant adjustments that can be made to each image, before you start getting picky and tweaking other things like Color Balance and such. Good luck! - Sands <x>< --- Andy Stewart <andystewart@attbi.com> wrote:
Hi Everybody,
I've been playing with my new toy, an Epson 1660 Photo scanner, which works very nicely with Linux.
I have noticed that photos that I scan in and then print don't look the same as the original. I am using Xsane, Gimp-Print, and CUPS. If it matters, the photo is 4x6 inches, scanned at 400 DPI, and printed in 1440x720 high quallity mode. The photo was originally printed from my 3 Mpixel digital camera (2160x1440 pixels), so I believe I've used a more than sufficient DPI when scanning.
I suspect the problem is that neither the scanner nor the printer is perfect, and that the cumulative effects of the transfer functions (scanner to computer to monitor to computer to printer) are causing this. Its actually worse if I let Xsane compensate for me with its automatic adjustments of gamma, brightness, and contrast. Adjusting the image on my monitor screen probably isn't going to help much since my monitor isn't perfect, nor is there any guarantee that I have it properly adjusted.
Is there any good way, other than trial and error, to fix this? Would generating some simple test patterns help in making the proper adjustments?
Thanks,
Andy
-- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA USA http://www.wlug.org
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Hi Andy, I have just discovered that the GIMP can work with color profiles. See http://www.coloraid.de/, which was referenced at http://www.normankoren.com/color_management_3.html Norman Koren has a web site that discusses a lot of aspects of digital darkroom. To calibrate things, you need a printed color chart, an example of which is the IT8 target. I have seen them sold by Praxisoft for $70.00, but you can get the same chart from Germany for $10.00 US + $5.00 S&H. Check out SCARSE which is a Linux program for scanner profiles. HTH, Skip
-----Original Message----- From: wlug-admin@mail.wlug.org [mailto:wlug-admin@mail.wlug.org]On Behalf Of Andy Stewart Sent: Friday, December 27, 2002 1:09 AM To: Worcester Linux Users' Group Subject: [Wlug] Color matching scanned photos vs. printed output
Hi Everybody,
I've been playing with my new toy, an Epson 1660 Photo scanner, which works very nicely with Linux.
I have noticed that photos that I scan in and then print don't look the same as the original. I am using Xsane, Gimp-Print, and CUPS. If it matters, the photo is 4x6 inches, scanned at 400 DPI, and printed in 1440x720 high quallity mode. The photo was originally printed from my 3 Mpixel digital camera (2160x1440 pixels), so I believe I've used a more than sufficient DPI when scanning.
I suspect the problem is that neither the scanner nor the printer is perfect, and that the cumulative effects of the transfer functions (scanner to computer to monitor to computer to printer) are causing this. Its actually worse if I let Xsane compensate for me with its automatic adjustments of gamma, brightness, and contrast. Adjusting the image on my monitor screen probably isn't going to help much since my monitor isn't perfect, nor is there any guarantee that I have it properly adjusted.
Is there any good way, other than trial and error, to fix this? Would generating some simple test patterns help in making the proper adjustments?
Thanks,
Andy
-- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA USA http://www.wlug.org
_______________________________________________ Wlug mailing list Wlug@mail.wlug.org http://mail.wlug.org/mailman/listinfo/wlug
On Thursday 02 January 2003 10:39 pm, Skip Gaede wrote:
Hi Andy,
I have just discovered that the GIMP can work with color profiles. See http://www.coloraid.de/, which was referenced at http://www.normankoren.com/color_management_3.html
Norman Koren has a web site that discusses a lot of aspects of digital darkroom. To calibrate things, you need a printed color chart, an example of which is the IT8 target. I have seen them sold by Praxisoft for $70.00, but you can get the same chart from Germany for $10.00 US + $5.00 S&H. Check out SCARSE which is a Linux program for scanner profiles.
Hi gang, Thanks for the additional info. I'll take a look at this info shortly. I've also found some information in "Grokking the GIMP" with regard to how to use some features of the GIMP to enhance scanned images. This was most helpful when I discovered that scanning images from a magazine or calendar (printed material) caused a speckling effect to appear in the resulting image. The GIMP has a despeckling filter that removes this rather well in many cases. This entire topic has me wondering if a detailed examination of the features of the GIMP might be a good discussion for a future meeting. There seems to be much more there than originally meets the eye. Later, Andy -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA USA http://www.wlug.org
participants (4)
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Andy Stewart -
Karl Hiramoto -
Sands Fish -
Skip Gaede