Re: G4 10.4 or 10.5 looking for way to halftone a picture to print in BW
On 05/03/2012 09:50, James E. Therrault mjrtas...@gmail.com wrote: Back in the ancient computer days, I had a H/P Deskwriter that only had CMY (single cartridge) and it was the cat's butt then. Color work was not brilliant but I never had a bit of trouble with it. Later, I upgraded to a newer CMYK unit and it gave me nothing but grief! So much so that I vowed to never use another H/P product ever. And I haven't. In theory, CMY should produce perfect colors including black and it does so in traditional subtractive photographic processes just as RGB works in the additive processes. But it does not in the print process where every color media needs a black kicker to really make it work. JT (Who remembers many years in the photography and printing biz...) I wonder if you've got me beat? I have 46 years in the photo/printing biz from an apprentice at 16 through letterpress (Heidelbergs and Glockners), Litho (Heidelbergs and Fuji) to densitometer controlled limited edition printing for the Fine Art Trade Guild. Switched to prepress and management with Dainippon galley cameras, drum scanners and final film planning - then switched to study with an MA (now an MSc) in Digital Imaging at the London Institute. I also had a Deskwriter - a 510 model with black only and upgraded that to an A3 Epson 1200 with 6 colour printing. The subtractive CMY model in photography is not comparable with the CMYK print process as it uses continuous tone and specially coated materials to give it a much wider gamut of colours - print processes use plain paper and the tones have to be generated by dots to fool the human eye. Also the CMY inks for printing were never really perfected due to the wide choice and quality of papers and methods like gravure and web and the difficulty of printing heavy wet on wet areas - drying time was a big bug to printers thus the 100% black with maybe a ?% tint of C, M or Y or all three to produce a 'rich black'. I've never come across a CMY inkjet printer but obviously they must exist if you had one - they perhaps didn't last long as less colours seem to contribute less to the final image in inkjet even with the coated paper. Epson have some models which utilise 2 greys and black to produce better quality monochrome - not unusual as high quality BW printing of photographic books also used duotone and tritone. If only I could justify buying one. http://en.wikipedia.org/wiki/CMYK_color_model Pete -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Overclocked MDD
I've been trying to do something with a MDD that was a little beyond it so I overclocked a 1.42 to 1.5ghz. That wasn't quite enough so I tried for 1.58ghz. System Profiler is saying 1.5ghz. Xbench tests seems to be showing the correct amount of speedup though it's also saying I have 1.5ghz processors. I'm wondering if I might have had one bad resistor and am running one processor at 1.58 and one at 1.5ghz. I guess the reason I'm wondering is that years ago I tried OCing for the first time with a dual 867 and only did one set of resistors. It felt faster but I had each processor running at a different speed and System Profiler was still saying 867. When I did the second set it read the faster speed. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: Overclocked MDD
On Mar 6, 2012, at 11:01 PM, Wayne Stewart wrote: I've been trying to do something with a MDD that was a little beyond it so I overclocked a 1.42 to 1.5ghz. That wasn't quite enough so I tried for 1.58ghz. System Profiler is saying 1.5ghz. Xbench tests seems to be showing the correct amount of speedup though it's also saying I have 1.5ghz processors. I'm wondering if I might have had one bad resistor and am running one processor at 1.58 and one at 1.5ghz. I guess the reason I'm wondering is that years ago I tried OCing for the first time with a dual 867 and only did one set of resistors. It felt faster but I had each processor running at a different speed and System Profiler was still saying 867. When I did the second set it read the faster speed. I overclocked my 1.42GHz Mini to 1.58GHz. The problem with System Profiler About This Mac is that they don't actually measure the CPU speed. The firmware has values built-in, and it's a simple look-up process of stored possible values. The problem with 1.58GHz is that Apple never made any Mac with 1.58GHz CPU speed, so that value isn't stored in the look-up table. On the Mini, instead of reading 1.5GHz, which is a possible value, for some reason it would say 750MHz. The solution was to patch the firmware using a one-time mod by booting into Open Firmware and patching the values in the look-up table so that 1.58GHz now corresponds to whatever CPU/Bus parameter is being measured. This patch won't persist thru a PRAM zap or NVRAM reset, and if your PRAM battery dies you'd need to do the patch again. Here's the patch I used for my G4 Mini. It may or may not work for your MDD? There's no danger AFAIK, if you need to get back to the OEM firmware just zap the PRAM or reset the NVRAM and all is back to normal. This should also fix the L2 cache size if it's reported incorrectly: These are the values for 1.58GHz overclock: 1.58 GHz PowerPC G4 5e2ce2fd = 157997 = clock frequency 5e1da0c0 = 157900 = rounded-clock-frequency 5e178682 = 1578600066 = recalced-clock-frequency Here's the instructions on how to persist the 1.58GHz into the system so that About This Mac works properly: 1. Reboot the computer holding down Cmd-Opt-O-F to enter the Open Firmware command line. 2. Type nvedit and press Return 3. Enter the following script exactly, pressing Return at the end of each line. dev / 9eb18ef encode-int clock-frequency property dev /cpus dev PowerPC,G4@0 5e2ce2fd encode-int clock-frequency property 9eb18ef encode-int bus-frequency property 5e1da0c0 encode-int rounded-clock-frequency property 5e178682 encode-int recalced-clock-frequency property 27ac63b encode-int timebase-frequency property dev l2-cache 5e2ce2fd encode-int clock-frequency property dev / 4. Press Ctrl-C to exit the editor. 5. Type nvstore and press Return 6. Type setenv use-nvramrc? true and then press Return 7. Type reset-all and press Return If you use these instructions please report back the results so we'll know whether or not they work on the MDD also. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: Overclocked MDD
I just realized your MDD is dual-CPU. This will likely require a slightly different patch because the G4 Mini is single CPU. The line in the patch dev PowerPC,G4@0 would likely need an additional CPU which I'd guess would probably be identified as G4@1? I don't know the nuances of Open Firmware, so it's possible the solution for dual CPUs could be as simple as appending G4@1 to the dev PowerPC,G4@0 like this dev PowerPC,G4@0,G4@1? Since I don't know the real answer for dual CPUs I think that the simplest solution would be to enter the entire patch TWICE, once for G4@0 and once for G4@1 in the line dev PowerPC,G4@0. If you want to do this in a single operation without an intermediate reboot, you could enter up to step #5 nvstoreReturn for G4@0 and then repeat from step #1 again for G4@1 and only after the 2nd step #5 proceed to #6 #7 which tell the Mac to use these alternate stored versions and reboot. It's possible you may need to read up on Open Firmware commands for this dual CPU patch to work correctly, but it should be possible. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
