need a test print

[colin]

Hi, Im looking at the canon Pixma iP4300 printer
but think il take advantage of getting a test print from it first,
I want to try and see if it can print a codewheel 50mm diameter with 2000
lines,
ive tried a few free cad packages and created simple drawing with 2000
'spokes' but cant seem to find a way of getting it to a jpg file
without such loss of resolution the spokes are merged into 1 circle,

anyone know of a good proggy to create a jpeg file like this ?
or even know where a jpg file like this is or as good a test print ?

Ive scanned an existing codewheel but its not very good even though I have
1200dpi scanjet 5300c, the actual lines are too fine to see with a naked
eye, you can see them on the scan but not well enough defined for printing.

I want to make a second code wheel with 1 less lines than the other.

Colin =^.^=

 

[petrus bitbyter]

Hi, Im looking at the canon Pixma iP4300 printer
but think il take advantage of getting a test print from it first,
I want to try and see if it can print a codewheel 50mm diameter with 2000
lines,
ive tried a few free cad packages and created simple drawing with 2000
'spokes' but cant seem to find a way of getting it to a jpg file
without such loss of resolution the spokes are merged into 1 circle,

anyone know of a good proggy to create a jpeg file like this ?
or even know where a jpg file like this is or as good a test print ?

Ive scanned an existing codewheel but its not very good even though I have
1200dpi scanjet 5300c, the actual lines are too fine to see with a naked
eye, you can see them on the scan but not well enough defined for
printing.

I want to make a second code wheel with 1 less lines than the other.

Colin =^.^=

Colin,

Don't use JPG. That's using a lossy compression loosing details whenever
it's saved. Suppose GIF to do better as it is lossless.

petrus bitbyter

 

[martin griffith]

Hi, Im looking at the canon Pixma iP4300 printer
but think il take advantage of getting a test print from it first,
I want to try and see if it can print a codewheel 50mm diameter with 2000
lines,
ive tried a few free cad packages and created simple drawing with 2000
'spokes' but cant seem to find a way of getting it to a jpg file
without such loss of resolution the spokes are merged into 1 circle,

anyone know of a good proggy to create a jpeg file like this ?
or even know where a jpg file like this is or as good a test print ?

Ive scanned an existing codewheel but its not very good even though I have
1200dpi scanjet 5300c, the actual lines are too fine to see with a naked
eye, you can see them on the scan but not well enough defined for printing.

I want to make a second code wheel with 1 less lines than the other.

Colin =^.^=

whats a codewheel? Something from the Enigma machine?


martin

 

[colin]

whats a codewheel? Something from the Enigma machine?

Ha sounds like it could be lol, but no its just part of a rotary encoder
http://www.avagotech.com/pc/images/product/Product Image/94169.jpg

Colin =^.^=

 

[colin]

Colin,

Don't use JPG. That's using a lossy compression loosing details whenever
it's saved. Suppose GIF to do better as it is lossless.

Good point but the test print service only accepts a jpg.
I wouldnt use it for the final thing.

Colin =^.^=

 

[Roger Hamlett]

message


Good point but the test print service only accepts a jpg.
I wouldnt use it for the final thing.

Colin =^.^=

Depending on what package you are using, you should be able to turn the
jpeg compression off. This is what digital cameras do, when asked to
return a 'raw' image, set the compression and smoothing, both to 0%.
The answer to your 'wheel' question, depends on how far out along the
spokes you are using the wheel, and therefore the line pitch. At the edge
of the wheel (50mm), the line pitch is 0.078mm. This is only 323LPI, and
most inkjets can comfortably manage this _but only with the right paper in
use_. Most photo quality inkjet 'papers', are actually plastic films on a
paper base, with the film deliberately designed to _merge_ the ink from
multiple dots, usually spreading the ink out to an effective dot size
around 150 to 200DPI. Certain non absorbent films will give more accurate
fine line reproduction. However the best way will be to create a
monochrome tiff image, and go and see a company who has a laser PCB
setting machine. The basic dot pitch on these, typically ranges to over
9000DPI, and using the acetate film these are normally operated with,
1000LPI, is relatively simple to achieve.

Best Wishes

 

[Rich Grise]

Hi, Im looking at the canon Pixma iP4300 printer
but think il take advantage of getting a test print from it first,
I want to try and see if it can print a codewheel 50mm diameter with 2000
lines,
ive tried a few free cad packages and created simple drawing with 2000
'spokes' but cant seem to find a way of getting it to a jpg file
without such loss of resolution the spokes are merged into 1 circle,

anyone know of a good proggy to create a jpeg file like this ?
or even know where a jpg file like this is or as good a test print ?

Ive scanned an existing codewheel but its not very good even though I have
1200dpi scanjet 5300c, the actual lines are too fine to see with a naked
eye, you can see them on the scan but not well enough defined for printing.

I want to make a second code wheel with 1 less lines than the other.

You could download a .pdf creator, like pdf995 - AFAIK, pdf's are scalable.

Good Luck!
Rich

 

[colin]

Depending on what package you are using, you should be able to turn the
jpeg compression off. This is what digital cameras do, when asked to
return a 'raw' image, set the compression and smoothing, both to 0%.
The answer to your 'wheel' question, depends on how far out along the
spokes you are using the wheel, and therefore the line pitch. At the edge
of the wheel (50mm), the line pitch is 0.078mm. This is only 323LPI, and
most inkjets can comfortably manage this _but only with the right paper in
use_. Most photo quality inkjet 'papers', are actually plastic films on a
paper base, with the film deliberately designed to _merge_ the ink from
multiple dots, usually spreading the ink out to an effective dot size
around 150 to 200DPI. Certain non absorbent films will give more accurate
fine line reproduction. However the best way will be to create a
monochrome tiff image, and go and see a company who has a laser PCB
setting machine. The basic dot pitch on these, typically ranges to over
9000DPI, and using the acetate film these are normally operated with,
1000LPI, is relatively simple to achieve.

Thanks for the info, and good ideas too,
however what im after atm is simply an image so that I can test a printer ..
canon offer a test print service where if you send them a jpeg file <1mb
they will print it out on the printer of your choice and send it to you.

Yes I work out the line pitch at ~0.08mm however I would like a few more
pixels per line,
the canon printer seems amazingly high resolution so i would like to try it,
I need a new printer anyway,
ive tried a couple of free cad packages, dessIII and progecad so far,
but it seems limited when outputing to a picture type file,
doesnt seem to have an option to set the resolution,
iva managed to save it as an .eml file wich looks good in msfaxviewer
but any other app it seems to have limited resolution

I just need a simple app that can draw radial lines and output it to a jpg
file with high resolution.
or a good pic that will show up the resolution.

Colin =^.^=