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- Preliminary HP_500C driver (also support HP_Deskjet)
-
- (c) Copyright 1985-1991 Commodore-Amiga, Inc. All Rights Reserved
-
- For Testing and Personal Use Only
-
- Installation
- ============
- To install this printer driver on your system, just double-click
- the Install_HP500C icon (or from CLI, copy the file HP_500C to your
- DEVS:printers directory).
-
- Then bring up the Workbench Printer Preferences editor and select
- the HP_500C driver.
-
- Read the rest of this README regarding proper PrinterGFX Preferences
- Threshold and Density settings.
-
- About the Driver
- ================
- This HP_500C driver is an preliminary version of an HP_Deskjet printer
- driver which supports the HP 500C printer.
-
- This driver is suitable for the DeskJet, DeskJet Plus, DeskJet 500
- and DeskJet 500C printers. The driver has been tested with both the
- 500C and original DeskJet printer.
-
- For the 500C both color and B&W graphics are supported. For compatibility
- the maximum number of dots vertically is 3000 (at 300 DPI) when US Letter
- papersize is specified. Select CUSTOM as papersize to get 3100 dots
- vertically. For color graphics, 3065 dots (at 300 DPI) is used for both
- US Letter and CUSTOM printer preferences. Other paper sizes are calculated
- as before.
-
-
- Support for DINA4 and US Legal paper sizes tested and seems OK.
-
-
- Threshold Settings for Adjusting Color Output
- =============================================
- Usually, the Preferences Threshold setting only affects B&W printouts.
- This driver looks at your PrinterGFX Preferences Threshold setting
- when doing a color graphic dump and applies a brightness correction
- (lightening of the output) as listed below, based on your Preferences
- threshold setting of 1 to 15. In addition, a correction to make
- CYAN one step lighter is applied. On a greyscale graphic dump,
- a fixed brightness correction is applied. In either case (color or
- greyscale), a threshold value of 1 will cause NO correction
- to be applied.
-
- Please test and see if any of these corrections are to your liking.
- We suggest you select both Blue and Green color correction in Preferences.
- We found Threshold setting 10 (correction enhanced -4) to be best.
- (Art Department Pro users - see the note later on).
-
-
- -------------------------------------------------------------------------
- Some additional tips from our tester
- ====================================
- 1) For most color graphics, a setting of threshold = 10
- gives best results (or whatever that table is in the final
- version, currently thresh=10 is best)
- 2) For all color graphics using halftone dithering, with Red Color
- Correction OFF and Green and Blue Color Correction on,
- gives best results.
- 3) Color Graphics are not vibrant on normal or bond paper, use
- Paintjet paper (Clay Coated) for good color graphics.
- 4) Use Density = 7 for Color Graphics on Paintjet Paper,
- Density=6 for color graphics on normal paper.
- 5) For Grey Scale use Density = 7, halftone dithering for best results.
-
- Basically, set threshold to 10, density to 7, dither to halftone,
- Turn Red Color Correction OFF, Green and Blue Color Correction ON,
- and forget about it. Graphics will print out great all the time.
-
- One caveat, when running low on Ink in a color cartridge, color balance
- goes wacky, but not too wacky, so it makes it look like something
- is wrong with the driver or program. In fact replacing the ink cartridge
- is in order, run a self test and you can see if the cartridge is going
- south.
- -------------------------------------------------------------------------
-
- NOTE - These driver-applied corrections will have NO impact if
- you have Floyd-Stienberg dithering selected. In addition, if you
- select Threshold value 1, there will be no corrections applied.
-
-
- NOTE FOR ART DEPARTMENT PROFESSIONAL USERS
- ==========================================
- If you are using a package with its own enhanced printing support
- such as Art Department Professional by ASDG, you will probably want
- to turn off all corrections and set the Threshold to 1 when you do
- color or greyscale graphic dumps. Otherwise, the driver corrections
- will cause interference with the internal dithering and corrections
- applied by ADPro.
-
-
- Density Settings for Shingling and Depletion
- ============================================
- The density settings over 4 control shingling and depletion:
-
- /* Set Shingling and Depletion according to density:
- *
- * 1-3: No depeletion, no shingling (75, 100, 150 DPI)
- * 4: 25% depletion, no shingling (300 DPI)
- * 5: 25% depletion, 50% shingling
- * 6: 25% depletion, 25% shingling
- * 7: No depletion, 25% shingling
- *
- * Use density 7 for transparancies.
- *
- * Depletion is ignored in B&W mode on all models.
- */
-
-
-
- For those who are interested in the technical details
- =====================================================
- These are the brightness corrections as controlled via Threshold:
-
- * Lightening for grayscale printouts
- * no correction if threshold = 1
- DC.B 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
- * hard-coded correction otherwise
- DC.B 0,1,1,2,3,3,4,5,5,6,7,8,9,11,13,15
-
- (note - there are two extra no-correction tables here in driver)
-
- * Lightening for color printouts (CYAN correction uses threshold + 2)
- * 1 = no correction (Threshold 1 means NO CORRECTION on any color)
- DC.B 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
- * 2 = no correction (but CYAN gets corrected with table 4)
- DC.B 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
- * 3 = no correction (but CYAN gets corrected with table 5)
- DC.B 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
-
- * 4 = enhanced linear -1 (CYAN uses table 5, etc.)
- DC.B 0,1,2,3,4,4,5,6,7,8,9,10,11,12,13,14
- * 5 = linear -1
- DC.B 0,1,1,2,3,4,5,6,7,8,9,10,11,12,13,14
-
- * 6 = enhanced linear -2
- DC.B 0,1,2,2,3,3,4,5,6,7,8,9,10,11,12,13
- * 7 = linear -2
- DC.B 0,1,1,2,2,3,4,5,6,7,8,9,10,11,12,13
-
- * 8 = enhanced linear -3
- DC.B 0,1,1,2,2,3,3,4,5,6,7,8,9,10,11,12
- * 9 = linear -3
- DC.B 0,1,1,1,2,2,3,4,5,6,7,8,9,10,11,12
-
- * 10= enhanced linear -4
- DC.B 0,1,1,2,2,3,4,5,5,6,6,7,8,9,10,11
- * 11= linear -4
- DC.B 0,1,1,1,2,2,3,3,4,5,6,7,8,9,10,11
-
- * 12= enhanced linear -5
- DC.B 0,1,1,2,2,3,3,4,5,5,5,6,7,8,9,10
- * 13= linear -5
- DC.B 0,1,1,1,2,2,2,3,3,4,5,6,7,8,9,10
-
- * 14= enhanced linear -6
- DC.B 0,1,1,1,2,2,3,3,3,4,4,5,6,7,8,9
- * 15= linear -6
- DC.B 0,1,1,1,1,2,2,2,3,3,4,5,6,7,8,9
-
- * 16= enhanced linear -7 (for CYAN when threshold is 14)
- DC.B 0,1,1,1,2,2,2,3,3,3,4,4,5,6,7,8
- * 17= linear -7 (for CYAN when threshold is 15)
- DC.B 0,1,1,1,1,2,2,2,3,3,3,4,5,6,7,8
-
- The enhanced corrections are hand adjusted correction tables
- which are partway between linear and gamma correction. These tables
- were developed by Roger Uzun.
-
-