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deadshot Feb 5, 2013 11:25 AM

Luminence sharpening
I'm interested to know ,can I do luminence sharpening in P/S/E 4 or would I need a later version or even full Photoshop?? I've tried to do it in my P/S/E 4 but not succeeded .Thanks

Photo 5 Feb 5, 2013 11:33 PM

I know I can do it in lightroom 3 and photoshop elements 10. I no longer have any of the earlier versions of p/s/e as I recently clean out my hard drive of old programs I never use


TCav Feb 6, 2013 6:47 AM

I use PSE6, and I can't find anything that looks like "luminence sharpening". Where do you see it in PSE4?

That sounds suspiciously like Acutance.

deadshot Feb 6, 2013 8:39 AM

I was looking on You tube and a chap there was showing his images that were taken on the Pana FZ200 .He said they were sharpened by Luminence Sharpening. So I Googled it and found a site where it described how to do it, apparently it works well with images that are noisy. The description gave me the impression that I could do it in PSE 4 which I dont think I can. Hence the question. At least PSE 10 seems able. I'm toying with the idea of getting the FZ200 to replace my old FZ7.

TCav Feb 6, 2013 9:45 AM

Ok, I went to YouTube and watched some videos.

Playing with the colors isn't "sharpening", and what little "sharpening" they talked about is just increasing the Acutance. You can't actually make an image sharper without increasing the resolution of the image sensor and/or the resolving power of the lens. That is, it's not something you can do in post-processing.

tclune Feb 6, 2013 10:46 AM


Originally Posted by TCav (Post 1336667)
You can't actually make an image sharper without increasing the resolution of the image sensor and/or the resolving power of the lens. That is, it's not something you can do in post-processing.

This isn't really true. There is such a thing as a deconvolution, which can be used to sharpen images that have suffered some sort of degradation. For example, the Hubble telescope images were sharpened by deconvolution before the corrective lens was retrofitted during a rather dramatic space walk some years back.

A program like FocusMagic or the FocusLabs InFocus module allow you to apply deconvolutions to images, which can help correct misfocusing and some kinds of lens imperfections. To really do it right requires a thorough characterization of the specific lens aberrations, because you are basically dividing the frequency-domain image by the frequency domain spectrum of those aberrations to undo the messed up image, which is mathematically the convolution of the ideal image and the aberrations introduced by the optics. Any of the do-it-yourself deconvolutions apply some sort of best guess for the aberrations to the image you want to correct, so they are never precise and often make things worse. But, when they work, they actually can recover detail that was not apparent in the messed-up image.

If you are just applying unsharp masking or the like, you are correct that all you are doing is edge-enhancing, which makes the image appear sharper without recovering any real detail. FWIW

deadshot Feb 7, 2013 9:35 AM
"This is a sharpening method that works particularly well for images with a higher noise level. An image is typically made up of three colour channels: red, green and blue. If you go to the channels palette by selecting Window -> Channels and then look at the individual colour channels of your image, you'll find that the different channels usually have a different amount of noise in them. Very often the blue channel is the noisiest one.
Luminance sharpening allows you to only sharpen the luminance part of your image without touching the individual colour channels.
Enable all colour channels again by clicking the RGB channel, then select Image -> Mode -> Lab Color and you'll see that all of a sudden the image is made up of a lightness channel and two coulour channels labeled a and b. Click on the eye symbol next to the a and b channels and select the lightness channel only. Now apply your usual Unsharp Mask to the lightness channel only and after you are finished, re-enable all channels by clicking the Lab channel.
Convert your image back to RGB mode by selecting Image -> Mode -> RGB and you're done."

This is the site and what got me wondering about Luminence Sharpening and why I cant do it in PSE 4

TCav Feb 7, 2013 11:12 AM

I can't seem to do that in PSE6 (even manually) so it stands to reason that you wouldn't be able to do in PSE4.

deadshot Feb 8, 2013 1:24 PM

Photo 5
It looks like I'll have to give in and get PSE 10 at some time.

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