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Help Wanted (pixels And Resize)  
User currently offlineUlvar From , joined Dec 1969, posts, RR:
Posted (12 years 8 months 1 week 4 days 19 hours ago) and read 1667 times:

This might have been discussed before

My question is after I have scanned a slide it might be 2500x (something, bright and shinning) one step is to resize it to some where between 1280 and 1024. When I do that in PSP 7.0 I usually receives a picture where the text on the aircraft gets odd (hard to explain) but the pixels around registration and other places gets blurry, but in the original scan its looks stunning and clear.

Is there any software out there not messing up the pixels during resize? or am I doing something wrong, or is it no way around ?

Have Photoshop 6.0 and PSP 7.0 + GIMP installed, is one of this better then the other when resizing.

Kind regards

Andreas

8 replies: All unread, jump to last
 
User currently offlineHias From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 8 months 1 week 4 days 17 hours ago) and read 1600 times:

Hi Andreas,

try to scan the picture with less resolution (let's say about 1300 dpi) and you won't have to resize it, if your scanner can do this.

I am also using PSP 7.0 and I am scanning my slides with it. After scanning I first crop them, resize them, then brighten it a little bit and last but not least use the "sharpen" twice. When you are using "sharpen more" it will get too grainy. That works ! I don't have any rejection because of the image quality.

Here are some examples of my pictures:


Click for large version
Click here for full size photo!

Photo © Mathias Henig



Click for large version
Click here for full size photo!

Photo © Mathias Henig



Click for large version
Click here for full size photo!

Photo © Mathias Henig



Click for large version
Click here for full size photo!

Photo © Mathias Henig



Hope that helps.

Regards

Mathias
http://www.spotter.de.vu
mathias.henig@gmx.de


User currently offlineUlvar From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 8 months 1 week 4 days 16 hours ago) and read 1590 times:

Thank you for your answer

I usually goes for 2800dpi as I thought that would be the best one. Going to try your tips later on today.

Kind regards

Andreas


User currently offlineJwenting From , joined Dec 1969, posts, RR:
Reply 3, posted (12 years 8 months 1 week 4 days 16 hours ago) and read 1585 times:

Another tip I've found is to always scan at a real multiple of the size you want. So if you want a 1024 px wide image, scan at 1024, 2048, 4096, etc. pixels wide and not at e.g. 2589 (or whatever other value).
This is supposed to prevent the software from interpolating between pixels when resizing to the final image size.


User currently offlineCkw From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 8 months 1 week 4 days 15 hours ago) and read 1584 times:

I always scan at the max res my scanner is capable of and use this file for post-processing. When I am happy with the file I resample down to 1024 pixels. I then use unsharp mask to sharpen the image up again. In theory, working with exact ratios when resampling should help in quality, however, when using Photopaint I haven't noticed this providing any visible improvement, though the fact that I am starting with very large files may have something to do with this.

Cheers,

Colin


User currently offlineUlvar From , joined Dec 1969, posts, RR:
Reply 5, posted (12 years 8 months 1 week 3 days 18 hours ago) and read 1555 times:

Thanks for all the answers, this forums is a great place to receive help from.

I tried all your tips and many of them gave me tremendous improvement to my pictures, so am mighty grateful for all your help.

Kind regards

Andreas


User currently offlineGerardo From , joined Dec 1969, posts, RR:
Reply 6, posted (12 years 8 months 1 week 3 days 14 hours ago) and read 1551 times:

Colin said: "When I am happy with the file I resample down to 1024 pixels. I then use unsharp mask to sharpen the image up again."

In another topic (some months back) somebody wrote, that you have to use "Unsharp Mask" before resizing.

Now, which is the right way? Unsharp mask before resizing, or vice versa?

Gerardo


User currently offlineCkw From , joined Dec 1969, posts, RR:
Reply 7, posted (12 years 8 months 1 week 3 days 14 hours ago) and read 1549 times:

You may or may not want to apply unsharp mask before resizing, depending on the output from the scanner. If it looks soft, I'm inclined to do so, since I "archive" my original scans for possible printing etc.

Following resizing you will always need to apply unsharp mask whether or not you sharpened prior to resizing. What might differ is the amount required, depending on how much was applied initially and the degree of resampling.

My experiments would suggest that there is no particular advantage to sharpening before resampling if you are only interested in the final version - indeed, sharpening twice increases the risk of generating unatural looking fringes, jaggies and other horrors.

Cheers,

Colin



User currently offlineGerardo From , joined Dec 1969, posts, RR:
Reply 8, posted (12 years 8 months 1 week 2 days 21 hours ago) and read 1530 times:

Thanks very much, Colin!!

I give it a try next weekend, as I recieved my 180 pics, which are waiting to be reviewed and some of them scanned.  Smile/happy/getting dizzy

Regards
Gerardo


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