what is the best way printing photos on Riso GR 3770

[Guest]

Hey,

we want to print black-and-white and color photos on a Riso GR 3770 and we dont know how.
the actual problem is, that we just tested, and we do not really know how to influence the grid itself?
does anybody have an idea about different variations of using raster settings on the riso?
Any recommondations for having the best results?

thanks in advance
florian and timo

[20gaugeO/U]

"print" thru an SC or original off the glass?

[probebühne]

with a SC Rip.

thank you

[RRodgers]

Yeah, RIP is going to give ya the best quality.

[probebühne]

yeah,

but how can we prepare a photo to archieve the best quality.
Whats about the adjustments on the riso (line, photo-mode...)
and whats about adjustments in photoshop, (bitmap, resolution, halftone screen...)

is there something like a profile ?
and do we need necessarily hd-master or hd-ink?


and the next step is what is the best way to print a photo with 2 colors....

thank you!

[bigste]

I use same machine and photos are not a strong point. Firstly the riso should be in good order especially the pressure roller, that's the rubber roller under the drum. Take it out and check it with a straight edge and make sure there is no ink build up. Also check the surface of the drum for creases. Best results are with HD ink and masters. Also best results do not come on std copy paper, a paper for duplicators gives better images. All the above count and together they can make a big difference. Most critical being the roller. Non original masters definately do not give the best results. I've tried several non oem masters and non are as good as riso but for most jobs they are acceptable.

[joelsa12]

it is not an exact science. pictures are all different. some are light some are dark there is not a defined way to do this. most important thing to consider is dot gain. your computer will be assuming that you will be printing to a laser printer. when this assumption is made and you print to the riso you get very dark photos. dot gain is the fact when you put a drop of ink on a piece of paper it will spread as it gets absorbed and drys. there are also settings in the print driver for using abs screening or grain coverd screen. there also should be a place to change the LPI and the angle of the screen in the print driver. these are once again things that can be changed on a picture by picture basis depending on what your photo looks like.

[20gaugeO/U]

Use genuine Riso supplies. Make a master and run 10 copies. If you don't like it change the above mentioned settings and make a new master. Trial and error. All depends on the pics.