hey guys,
I'm new in the forum, i need about bitmap processing. I don't have a RIP software. so I'm sticking it with bitmap. does anybody know the procedures? all i know is the separations of CMYK in photoshop and had it halftoned through bitmap but i have the wrong gauges for the dots... when i set up the screens the dots fall off. so all i need is the exact numbers to fill in to have the right dot sizes or the screen gauges.
please advice guys.. thanx
all i know is the separations of CMYK in photoshop and had it halftoned through bitmap
Are you trying to do 4 color process printing? Is "bitmap" some sort of program i don't know about? your wording is confusing. i only know "bitmap" as a raster image file-type.
Quote:
but i have the wrong gauges for the dots... when i set up the screens the dots fall off.
I'm not sure how to create halftone dot sizes in photoshop alone. Without a Raster Image Processor, it is probable that your output device cannot lay a dense enough layer of ink for a successful exposure. how are you measuring your dot sizes? what is your mesh count?
Quote:
so all i need is the exact numbers to fill in to have the right dot sizes or the screen gauges.
Is this the "screen" settings dialog in the output section of photoshop's print settings? I am pretty sure that these values won't work without a RIP somewhere along the lines. could be wrong.
try to be more specific with what you are trying to do, we'll try to get you a more specific answer...
that's the thing i can't afford a RIP software. iv'e been printing in the Philippines for quite a while, i design my shirts but i pay someone to color separate my four color separations and i see them do it... the thing is iv'e done it in photoshop, under bitmap and under halftonscreens but i don't have the right size for my dots i think they are to small. and i don't to do trial and error. coz i'm gonna waste so much emulsion... so i figured anyone might be using the same technique as i do...
Your screen mesh selection should be 4.5 to 5 times your halftone frequency. For example, a 50 line halftone should use at least a 230 mesh or higher.
Regarding bitmap halftones, I assume you're splitting your channels, converting to bitmap, and in the subsequent dialog boxes, specifying your halftone frequency, angle and dot shape, then saving the channel as a separate file. You should use an elliptical dot shape, by the way. They tend to bridge the mesh openings a little better.
bitmap processing procedures 
