Epson Standard Rgb Gamma 1.8 Download
Guy Clena
In photoshop I have two profiles for my Epson printer: "Epson sRGB" and "Epson Standard RGB - gamma 1.8". There was some default Epson profile, but it dissapeared after I was playing with the settings. Maybe this was the right profile, but I cant find it now.
I have a new Epson 3800 that I am profiling with Bill Atkinson's 1728 Eye One Pro target (linked to off of Eric Chan's excellent website). I am running the latest version of the Epson driver (6.5) and this gives me a possibility to specify a gamma of 1.8 or 2.2. Default appears to be 1.8, coupled with a Mode of Epson Standard (sRGB). Are those the settings I should stick with?
Keep in mind what you're trying to do with a target. The basic information you're trying to find out is "What color prints out when the printer is given X raw color number". If you specify gamma or srgb or some other profile at all. All those things transform the color numbers you're sending to the printer.
Hi, I have a R1800 and a calibrated monitor (2.2 gamma set). I noticed that my prints when using ICM profiles are way to dark. I did some test prints in Photoshop CS3 and no matter what Epson Print profile and paper combination I used I got a dark print.
Hi, I have a R1800 and a calibrated monitor (2.2 gamma set). I
noticed that my prints when using ICM profiles are way to dark. I
did some test prints in Photoshop CS3 and no matter what Epson
Print profile and paper combination I used I got a dark print.
Mike Chaney in the documentation for his printer profiling software "Profile Prism" states that the R1800 output is dark when ICM is set to "Off." His options are use the "color controls" setting at gamma 1.8 and "Adobe rgb" or use a lighter calibration target. He points out that the print density is less affected by the paper type settings when in color controls mode.
I took someone's suggestion and installed the latest driver from the epson web site, version 6.5aAs. The driver I orignally had was 6.15. This was shown when I ran the uninstall program first, in the start menu. It was different from the number I saw when opening the printer settings screen by double clicking on my system tray icon.
Mike Chaney in the documentation for his printer profiling software
"Profile Prism" states that the R1800 output is dark when ICM is set
to "Off." His options are use the "color controls" setting at gamma
1.8 and "Adobe rgb" or use a lighter calibration target. He points
out that the print density is less affected by the paper type
settings when in color controls mode.
I use the "color controls" setting when I do a custom profile and
have better results than using "ICM" set to "off." The profiles DO
have an effect when using "color controls."
td
I print right from photoshop and expect my R1800 printer to print what I see on my monitor. Jacking up the brightness and such is lame way to go. In my limited time on this forum, it appears that almost every situation is (there are exceptions of course) because the monitor is too bright or the settings are wrong. I use only Adobe gamma for monitor calibration and get great matching prints using standard profiles provided by Epson. Here are screen shots of my custom paper profile (assuming Epson Premium Glossy paper) photoshop and Epson printer settings:
Get marvelous matches, btw using oem epson ink.
--
Dave
_forum
'Life externalizes at the level of our thought'
Electronic display devices-things like computer terminals, television sets, printers, and cameras-do not respond to, (or produce,) light intensity linearly; they are designed intentionally that way. The dominate standard for how display devices produce light intensity is the NTSC specification which requires a gamma of 2.2 to be used in US television receivers. A gamma of 2.2 means that if the transmitted signal increases by a factor of two, the corresponding light intensity on the television CRT increases by 2^2.2, which is a factor of about 4.6. A gamma of 2.2 has also been adopted by the World Wide Web Consortium as a standard, sRGB, for Internet browsers. Note: there is an addendum, ViewSonic VA503b Gamma Calibration, that uses the techniques outlined here for LCD computer monitors.
Unfortunately, not all manufactures subscribe to the standards. For example, a gamma of 1.8 is often used in printers, (since that was the gamma used in the original Apple Macintosh/LaserJet combination,) and other companies, like Silicon Graphics, have their own gamma standard, (a gamma of 1.6 is used in Silicon Graphics' terminals.) Additionally, the European standard for television receivers is a gamma of 2.9, and many monitors use this value to increase depth of color. Note that as long as gamma is consistent for all display devices, (for example, Apple uses a gamma of 1.8 on their display, and on the LaserJet printer, both,) all will exhibit the same response to light intensity.
But there are compounding issues-most electronic printers have programmable gamma settings, (so one could, in principle, do artwork on a Silicon Graphics machine, and print it on an Apple/LaserJet printer, for example.) However, printer paper alters the printer's gamma; not to mention that most digital cameras have programmable gamma settings, too, as do almost all electronic display devices.
I will demonstrate a calibration proceedure for system gamma, (system gamma means that all devices-printer, terminal, camera, etc.,) have the same gamma. The proceedure will calibrate the monitor first, and then use that as the standard for calibrating other devices.
First point your browser at Norman Koren's excellent gamma page, and about half way down the page is a gamma chart. Make sure the room in which you are working has minimal light, and it comes from behind the screen to avoid reflections. Turn the intensity on your monitor to maximum, and set the degrees Kelvin to 6500K. Adjust the brightness on the monitor until you can just see the left hand vertical bar at the bottom, (the one labeled "A",) and the right hand bar, (the one labeled "B",) should be visible from the bottom to about half way up the chart. Absolute black on your monitor is now calibrated.
Now adjust the gamma of your monitor such that the shade of gray completely across the "Gamma" column is the same at 2.2. You can use Adobe Photo Shop to adjust the gamma, or xgamma under X Windows on Unix/Linux systems.
The monitor is now calibrated, and will be used as a refererence standard for other devices-a digital camera and a printer will serve as examples. For these, you will need another gamma chart, gamma.png.Z, or you can use my copy:
I will use a FujiFilm FinePIX A205 for demonstration purposes. Darken the room, and take a picture-without flash-of the file gamma.png displayed on the calibrated monitor, (you can use your browser to display the file, Adobe PhotoShop, or ImageMagick's display command under Unix, etc. This will require a steady hand, but does not need to be a work of art. Download the picture out of the camera into the computer, and display it on the calibrated monitor. The shade of gray made by the black and white thin stripes should be the same as the background gray behind the number 2.2 at only 2.2, (for numbers less than 2.2, the gray made by the stripes will be too light, and for numbers greater than 2.2, the gray made by the strips will be too dark.) The picture I made to calibrate the A205:
used The Gimp to display the gamma.png file since it can be used to adjust gamma if I had to. If the camera does not produce a gamma of 2.2, then check the camera's documentation, and/or, use a program like The Gimp to pre-process files out of the camera before manipulation or printing. I usually print out of The Gimp, too, since some gamma correction will be required for printing a digital picture, depending on the type of printer paper, (yes, the type of printer paper does, indeed, change the gamma of the printer.)
The same technique used in calibrating the camera will be used to calibrate the printer. Make sure your print software will print ".png" files to your printer, (CUPS certainly does,) and print the gamma.png file. Many printers allow their gamma to be programmed, (1.6, 1.8, 2.0, and 2.2, are common values,) but if it doesn't, you can still adjust gamma for the printer in the print program, (like The Gimp.) If the printed output has a gamma of 2.2, then take a picture of it using flash, but make sure there is no light directly incipient on the paper, (the light will change the gamma unless you have a special light that produces a 5600K temperature.) I use an Epson Stylus Photo 780, and its calibration picture:
For the 780 I have to adjust gamma to accomodate different printing paper types. I personally use The Gimp for that. Here are the equations I use to calibrate the printer for different paper reflectivities.
Let I be the input light intensity, (say on the CCD of a camera,) that has an output file gamma, Gf, a printer gamma, Gp, and a correction gamma, Gc, (altered in the print program, The Gimp,) and an output light intensity, O, from printer. Then:
On the Epson 780 Photo Stylus printer, printing on photo copier stock, the gamma correction, Gc, required in The Gimp for a printed output gamma of 2.2 was 0.818; for Epson Professional Glossy Paper S041286, (68 lb, 10.4 mil, 97% Opacity, 92 ISO Brightness,) the required gamma correction was 0.636; and for Epson Glossy Paper S041141, (52 lb, 9.4 mil, 96% Opacity, 99 I SO Brightness,) the required gamma correction was 0.683.
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