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08/07/2003 10:13:25 AM · #1 |
Help!!!!! I had asked this question once before, and gotten some answers. Unfortunately, none of them helped. :-(
Here's the situation -- when I take a picture that has distinctively diagonal lines, it shows "jaggies." If I "blow it up" to full resolution size, they disappear. BUT, if I shrink/resize, etc to get to dpc legal size, there is no way I can get rid of them. I have tried resize, bicubic resample, bilinear resample, and the fourth option I have but don't remember what it is called. I use PSP7. None of the options work. I still have these little blocks on the diagonals in an otherwise perfectly focused picture.
HERE is an example albeit it not the one that shows it the worst. For that, you will have to wait for the current voting to end. In this picture, it shows up in the roof of the barn, and a little on the bridge. The picture IS in focus, and it is not compressed excessively. AND they don't show up at all on the prints.
Is a camera thing? A paint shop thing? A me thing??
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08/07/2003 10:24:27 AM · #2 |
| I have a similar problem with pictures that have a lot of fine-detailed foliage. They appear good at normal screen resolution (1024 x 760), but pixelated when reduced (though only on screen and NOT on print). Techies can correct me here, but I think that these pixelations/artifacts are due to our screens' limitations. Nothing really we can do if what we want to show is far too detailed for the screen to handle (by that, I mean very dense population of contrasting pixels). |
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08/07/2003 10:30:56 AM · #3 |
Try adding an Un Sharp MAsk.. under Sharpen in PS7 sorry don't know about psp.. This may reduce the effect slightly.. but only by introducing a sort of anti-aliasing or slight blurring effect.. give it a go
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08/07/2003 10:33:32 AM · #4 |
Karma - what resolution are you saving at? Monitors will only display at 72ppi, and anything over that is more info than the computer needs. For a DPC entry, you can't exactly anti-alias with the smudge tool, so I'd suggest working with different numbers. Instead of resizing to 615, size to 616, then 617...see what exact numbers cure your problem. (this is like the border issue - if you add 1 px border, it doesn't add 1 px on all 4 sides, it adds 1px on TOP and LEFT. you have to add 2 px to make it 1px all the way around).
Also - Neat Image and PSP 8 both have ways to remove artifacts and jaggies. You should search their sites for ways to do so. :)
M
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08/07/2003 10:34:27 AM · #5 |
We have a similar setup. I have an F717 and use PSP7 as well.
Question: Do you apply "Sharpen" or "Unsharp mask" BEFORE you resize the image for DPC?
If so, that could be the problem. Always apply any sharpening you want to the image AFTER resizing.
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08/07/2003 10:34:50 AM · #6 |
Firs do unsharp mask then resize to printable size or go to 150-200 DPI at 16x20 inches or so.
After that do Blur/soften filter.
When you resize to smaller size with Photoshop or PSP do it in steps of 500 pixels.
For example go from 4000X3200 down to 3500X2800,next to 3000X2400 until you get 640X512 or other desired size!
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08/07/2003 10:44:48 AM · #7 |
Just to add my thought to the melee of opinions here: I suspect your image is too sharp to begin with, which causes the sharpening that is efffectively applied by re-sizing to 640xwhatever to emphasise that. My first port of call would be to soften the original image - either a gaussian blur, or, considering your going from near 5MP to 307,000, a straightforward 'blur', and then re-size. Final image will still look sharp, and the PSP algorithm won't get quite so extreme with your image.
Of course, this is only for DPC submissions.
Ed (PSP user)
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08/07/2003 10:54:33 AM · #8 |
| I have suffered in some past contests due to pixelation. Somehow, i don't think the coming one is going to be any different. I opened and closed the file too many times. Apparently, when I bought my camera, they forgot to tell me that if you open and close a JPEG like 100 times, it turns into a piece of crap. |
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08/07/2003 10:58:46 AM · #9 |
i don't know what software came with your camera, michele, but you might want to check and make sure that you are always saving your jpeg with the 100% of it's quality... there must a parameter for this some place in your settings...
Message edited by author 2003-08-07 10:59:18. |
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08/07/2003 10:59:18 AM · #10 |
Originally posted by PSUBecker:
I have suffered in some past contests due to pixelation. Somehow, i don't think the coming one is going to be any different. I opened and closed the file too many times. Apparently, when I bought my camera, they forgot to tell me that if you open and close a JPEG like 100 times, it turns into a piece of crap. |
only if you re-save it each time.
Ed
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