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Vcize
Joined: 18 Apr 2012
Posts: 1
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 Posted: Wed Apr 18, 2012 8:54 am Post subject: Applying filters to high-res images has little effect |
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When applying filters such as accented edges, ink outline, etc to a medium sized image (1024x768 or 1280x853) produce some pretty cool results.
However, when applying those same filters to larger images like files with a 5184x3456 resolution, the filters have little to no effect. I'm guessing this is because there are so many more pixels that altering each pixel has a less noticeable effect.
You can see an example here with the accented edges filter run over a smaller version of a picture I took, and then a larger one (that was then downsized to make it viewable):
http://www.vcize.com/images/accented-edges-1280x853.jpg
http://www.vcize.com/images/accented-edges-5184x3486.jpg
The 1280x853 one looks pretty cool. On the larger 5184x3456 version the filter had almost no noticeable effect.
The problem is that I want the cool looking version like is seen in the 1280x853 version, but at a high enough resolution to print on a large canvas that is, say, 40' x 40' or so. Is it possible to get the bigger image to look like the smaller one without losing the resolution required to print it on a canvas that large? I've been trying to figure this out for weeks now... |
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jerryb4417
Joined: 20 Dec 2008
Posts: 710
Location: Oklahoma
PS Version: photoshop cs5
OS: win7 pro 64 bit, i7-3.2g, GTS 450,
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| Posted: Wed Apr 18, 2012 10:17 am Post subject: |
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hi,
generally what i found is that very large images, menory and the computer speed become a issue...
are you sure the the filtering action finish or maybe it died before finishing becasue of the size ... i remember with my old win xp some filters took forever like maybe a half hour or an hour to finish on other boards saw reports on slow machine taking 2 hours... oh with my old xp it wasn't unusal that the filtering action would just stop because not enough memory ...
what you might try... is at the lower demsinsions... do your filtering... and then just do a sample resize enlargment... pay attenion to which bicubic you use... sometimes very good results and sometimes not...
also instead of enlarge in just one step use the 10% rule , enlarge in 10% increments.. untill you reach the desire number....
well those are my thought |
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thehermit
Joined: 05 Mar 2003
Posts: 3987
Location: Cheltenham, UK
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| Posted: Wed Apr 18, 2012 5:14 pm Post subject: |
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Once again jerry I find myself having to interject on the 'enlarge by 10% increments' arguement. If that was ever a valid move (real world tests show no benefit from a complete one shift solution), it certainly is not the case since the advent of Photoshop CS or certainly the demise of 7.
The 10% is certainly outmoded and was probably a fallacy anyway. (I concede there are arguments to the contrary).
_________________
If life serves you lemons, make lemonade! |
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jerryb4417
Joined: 20 Dec 2008
Posts: 710
Location: Oklahoma
PS Version: photoshop cs5
OS: win7 pro 64 bit, i7-3.2g, GTS 450,
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| Posted: Wed Apr 18, 2012 6:25 pm Post subject: |
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hi thehermit...
the 10% rule as far as my own experience and tesitng..... is mixed results... some i found it was fine and other times it a waste of time...
there another techniques that involves playering around with the ppi/pixels deminsions... but again mix results....
and i am not satisfied with photoshop cs5 straight forward meathod of resizing....
if i had my druthers and it was in my budget...lol
i go for one of the specialize software that deal speciffically enlarging... they seems to be very good and consistant.... |
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renata
Joined: 26 Nov 2010
Posts: 368
Location: Australia
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| Posted: Mon Apr 23, 2012 6:50 pm Post subject: |
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The accented edges filter has a slider for "edge width" - perhaps you need to increase this on a higher resolution file? |
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