I am trying to get the learning curve for images that when I take them to grayscale...which is all I am doing, and converting them to pixel, I am having a hard time figuring the best pixel size given the distance.
Also...when I go to resize the image, I know that it effects it.
I was wondering if there was a source for some sort of bssic parameters or rules to go by.
Any help would be appreciated
[ October 16, 2003, 04:07 PM: Message edited by: Robert Beverly ]
-------------------- Robert Beverly Arlington, Texas Posts: 1033 | From: Arlington, Texas | Registered: Jan 2001
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posted
Robert, you're asking for an awful lot here. I'm not surprised no one has answered yet. Your topic title states you're looking for some kind of simple halftone chart. I doubt you'll find any. There are just too many variables here. But if you just need to know how to maintain pixel count with image size, that can be done quite simply; even in Photopaint.
Go to Image, Resample and select whatever pixel count you prefer. Before clicking OK, set the size to what the final output will be. Be warned you may end up with an extremely large file. So make sure you have the room before you click OK.
Kodak used to make stuff like halftone screens and there were many types to choose from. With everything being computerized now, I'm not sure what all they still make. Do a search for "halftone screen chart" and you'll be confronted with many choices of sites to select from. Here's one I found which might be what you're looking for. http://fastfilms.com//about.php Good luck with your search.
-------------------- Bill Cosharek Bill Cosharek Signs N.Huntingdon,Pa
bcosharek@juno.com Posts: 704 | From: N.Huntingdon, Pa, USA | Registered: Dec 1999
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It's kind of hard to ask when your not sure what to ask for...I just thought there might be some reference to halftones like there is for letter distance charts for viewing...
I appreciate the link...
R
-------------------- Robert Beverly Arlington, Texas Posts: 1033 | From: Arlington, Texas | Registered: Jan 2001
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I believe they carry a number of products that can help you with this problem. They have a long history and are very reputable in the commercial art industry.
From my experience in silk screening, our way around this was to have the photograph enlarged to the needed size and to place a halftone filter over it and shoot film positives. The image remained crisp and accurate without the breakdown from pixelization. Maybe a variation on this technique would be a consideration.
Hope this helps... Rapid
-------------------- Ray Rheaume Rapidfire Design 543 Brushwood Road North Haverhill, NH 03774 rapidfiredesign@hotmail.com 603-787-6803
I like my paint shaken, not stirred. Posts: 5648 | From: North Haverhill, New Hampshire | Registered: Apr 2003
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Would you mind clarifying what your problem is, specifically, or what it is you want to achieve? Are you interested in screening something- there are some rules of thumb for half-tone line screen frequencies for certain screen mesh counts, so that the mesh can hold the dots. Or are you interested in large digital prints, and you want to enlarge a picture with a set number of pixels, so that none are lost, and none are created, but the size changed or something like that? Do you want pixellation? Are you trying to convert a greyscale picture to a halftone and unsure of how to, or are you after a specific special effect like an 'exploded bitmap pixellation' fade?
You can download halftone samples of 10 degrees of blackness from zero to 100%, in different dot/linescreen sizes, but you need a laser printer with Post Script drivers to output it.
If I'm creating a picture, or a collage of pictures, I find that starting with a blank document, of A4 page size, at 250 pixels per inch resolution, gives a nice photographic-quality picture with no apparent fuzziness when printed at 600 dpi on an inkjet printer.
Alternately, with a small picture, to be enlarged, look at the total size (no. of pixels in Image>size) and alter the resolution up or down, then alter the image size down or up, before pressing enter/OK, so that what you have is a new size of picture, with roughly the same original number of pixels- that way you minimise the degradation potential.
On the other hand, a big digital pic, blown up from a post card, and printed at 300dpi will look fuzzy from close up, regardless, unless you have a super powerful scanner able to pick up a sufficient number of different pixels so none need to be fudged.
Pixel size/quality/qualtity also depends a bit on how good your eyesight is (and how sleepy you are!)
Are you trying to get small photos to go on a billboard? What viewing distance do you want to work with? Are you trying for some special effect or another? Are you wanting a screen output? Why work in greyscale in this case? Halftones & pixels are separate entities. Are you trying to make one from another somehow?
Sorry if I misinterpreted your question and posted unnecessary comments/answers here. I'm still not clear what you're asking, or wanting to do. Maybe I'll learn something from the answer too!
[ October 17, 2003, 08:39 AM: Message edited by: Ian Stewart-Koster ]
-------------------- "Stewey" on chat
"...there are no limits when you aim for perfection..." Jonathan Livingston Seagull Posts: 7016 | From: Highgrove via Toowoomba, Queensland, Australia | Registered: Dec 2002
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