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Author Topic: Printer Moire? Help!  (Read 3359 times)

Gary Ferguson

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Printer Moire? Help!
« on: April 16, 2006, 04:16:10 pm »

Here's a shot I took recently while strolling around London.[attachment=446:attachment]

I was attracted to it because of the teddy bear in the window in the upper left corner, and the armed guard in the bottom right corner. And then I tried to frame it so it appears to be balancing on the apex of the central white roof.

It's not a great shot, but I'm fond of it and would like to print it to the best of its potential. But here's the problem, in that central inverted "V" shape is a large grille, at 100% viewing on the monitor my 5D and 24-105 4.0L have done a creditable job of resolving each wire. You can see this in the attached 100% crop.[attachment=447:attachment]

But when I print it on my Epson R2400 at 300dpi the grille assumes a moire pattern, similar to viewing on the screen at say 66% or 33%.

Where do I go from here? Print denser, ie 360dpi, or looser, ie 240dpi? Or do I have to start playing around at 301dpi etc? I've had this problem once or twice before with this R2400, and I'm beginning to think that 300dpi is perhaps not the optimum resolution.

Incidentally, may I give my thanks in advance for any help that's given, as I'll be away from my computer for the next week and wouldn't want anyone to think I'm being rude by not replying immediately.

Thanks, Gary
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digitaldog

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Printer Moire? Help!
« Reply #1 on: April 16, 2006, 05:01:42 pm »

Try using an even divisible of the printer's native rez (so 240, 360 etc). It will print a tad faster too. I suspect you'll have to try both (higher and lower) settings.
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Schewe

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Printer Moire? Help!
« Reply #2 on: April 16, 2006, 05:05:26 pm »

Quote
Where do I go from here? Print denser, ie 360dpi, or looser, ie 240dpi? Or do I have to start playing around at 301dpi etc? I've had this problem once or twice before with this R2400, and I'm beginning to think that 300dpi is perhaps not the optimum resolution.
[a href=\"index.php?act=findpost&pid=62724\"][{POST_SNAPBACK}][/a]

Depending on the print size and native (as apposed to upsampled-which won't really help) printing at 360 or 480 ppi will indeed help resolve moire as well as better resolve high frequency textural detail. But only up to a point. The one thing I notice in the detail shot is the angle of the offending slats...don't know your feeling on manipulation of scene details but if you were to straighten the slats relative to the verticals and horizantals you would also reduce the moire.
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Henry Goh

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Printer Moire? Help!
« Reply #3 on: April 16, 2006, 05:43:09 pm »

Quote
Here's a shot I took recently while strolling around London.[attachment=446:attachment]

I was attracted to it because of the teddy bear in the window in the upper left corner, and the armed guard in the bottom right corner. And then I tried to frame it so it appears to be balancing on the apex of the central white roof.

It's not a great shot, but I'm fond of it and would like to print it to the best of its potential. But here's the problem, in that central inverted "V" shape is a large grille, at 100% viewing on the monitor my 5D and 24-105 4.0L have done a creditable job of resolving each wire. You can see this in the attached 100% crop.[attachment=447:attachment]

But when I print it on my Epson R2400 at 300dpi the grille assumes a moire pattern, similar to viewing on the screen at say 66% or 33%.

Where do I go from here? Print denser, ie 360dpi, or looser, ie 240dpi? Or do I have to start playing around at 301dpi etc? I've had this problem once or twice before with this R2400, and I'm beginning to think that 300dpi is perhaps not the optimum resolution.

Incidentally, may I give my thanks in advance for any help that's given, as I'll be away from my computer for the next week and wouldn't want anyone to think I'm being rude by not replying immediately.

Thanks, Gary
[a href=\"index.php?act=findpost&pid=62724\"][{POST_SNAPBACK}][/a]

[span style=\'font-size:14pt;line-height:100%\']Hello Gary,

Try printing at 288dpi instead.

Henry[/span]
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p.tinson

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Printer Moire? Help!
« Reply #4 on: April 17, 2006, 12:13:04 pm »

The epson drivers interpolate to 360 or 720 ppi to avoid moire paterns on fine lines the image resolution needs to be the same or an even submutiple of of this resolution.
This would equate to 360 ppi or even 180 ppi.
240 ppi would reduce them but some would still be apparent.
Peter
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lester_wareham

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Printer Moire? Help!
« Reply #5 on: April 24, 2006, 10:32:52 am »

Quote
Here's a shot I took recently while strolling around London.[attachment=446:attachment]

I was attracted to it because of the teddy bear in the window in the upper left corner, and the armed guard in the bottom right corner. And then I tried to frame it so it appears to be balancing on the apex of the central white roof.

It's not a great shot, but I'm fond of it and would like to print it to the best of its potential. But here's the problem, in that central inverted "V" shape is a large grille, at 100% viewing on the monitor my 5D and 24-105 4.0L have done a creditable job of resolving each wire. You can see this in the attached 100% crop.[attachment=447:attachment]

But when I print it on my Epson R2400 at 300dpi the grille assumes a moire pattern, similar to viewing on the screen at say 66% or 33%.

Where do I go from here? Print denser, ie 360dpi, or looser, ie 240dpi? Or do I have to start playing around at 301dpi etc? I've had this problem once or twice before with this R2400, and I'm beginning to think that 300dpi is perhaps not the optimum resolution.

Incidentally, may I give my thanks in advance for any help that's given, as I'll be away from my computer for the next week and wouldn't want anyone to think I'm being rude by not replying immediately.

Thanks, Gary
[{POST_SNAPBACK}][/a]

You can test for this quite simply: Take a look at [a href=\"http://www.inkjetart.com/tips/ppi/index.html]http://www.inkjetart.com/tips/ppi/index.html[/url]
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