Labcolor sharpening in basic? - DPChallenge Forums

Olympus 12-40mm f/2.8 Pro

01/12/2008 10:38:05 AM · #1

Quick question. Is it legal to use labcolor sharpening in basic editing?

Ann

Olympus OM-D E-M1

01/12/2008 11:34:17 AM · #2

Originally posted by cloudsme:

Quick question. Is it legal to use labcolor sharpening in basic editing?

You might want to ask the SC. I don't remember this question coming up in the forums before. The basic rules say that you can apply the USM filter, as long as you apply it to the "entire image." I don't know if sharpening a single channel (the lightness channel in lab mode) violates the "entire image" rule or not.

I've never had the need to do this on a basic editing image, so I've never tried to find out.

edit: terminology and spelling

Message edited by author 2008-01-12 11:35:07.

01/12/2008 12:03:11 PM · #3

I thought it came up before, but did a forum search and couldn't find it. I don't have to do it, but in some situations it is better.

Sony DT 18-200mm f/3.5-6.3 Aspherical ED High Magnification Zoom Lens for Sony Alpha

01/12/2008 12:17:20 PM · #4

You can convert between color spaces in Basic, so converting to LAB and back is fine. You can also run an otherwise-legal operation on a single channel in Basic, as long as it's run globally (on the *entire* channel). So yes, you can convert to LAB, run USM on the Luminosity channel, and convert back.

Lonz

Sony DSLR-A700

01/12/2008 12:44:23 PM · #5

Well blow me away - I've never heard of such a process - if someone could please enlighten me as to the steps of lab color sharpening! Thanks in advance!

Bear_Music

Samsung Galaxy S24 Ultra

Sony 24-70mm F4 Vario-Tessar T* FE OSS

01/12/2008 01:03:48 PM · #6

Originally posted by Lonz:

Well blow me away - I've never heard of such a process - if someone could please enlighten me as to the steps of lab color sharpening! Thanks in advance!

A better way to sharpen just the luminosity channel without changing to Lab Color is to perform sharpening as you usually would (e.g., using Unsharp Mask), then choose Fade Unsharp Mask from the Edit menu. In the dialog that appears, change the Mode from Normal to Luminosity and click on the Okay button.

R.

TooCool

Canon EOS-300D Rebel

Canon EF 50mm f/1.8 II

01/12/2008 01:17:03 PM · #7

Originally posted by Bear_Music:

In the dialog that appears, change the Mode from Normal to Luminosity and click on the Okay button.

R.

But I thought that you could not change modes in basic...

Canon EF 24-105mm f/4.0L IS

01/12/2008 01:28:50 PM · #8

Originally posted by Lonz:

Well blow me away - I've never heard of such a process - if someone could please enlighten me as to the steps of lab color sharpening! Thanks in advance!

Go to mode under image menu and convert to labcolor. Under channels you will see a luminosity chanel and a and b. a and b are wierd color channels. Select the luminosity channel and sharpen that with usm. You can use more usm than ususal, without getting color noise or color halos. Convert back to rgb. I think too cool is right, you can't use different blending modes in basic, but this isn't quite the same.

scalvert

Canon EOS-5D Mark III

01/12/2008 01:31:53 PM · #9

Originally posted by TooCool:

But I thought that you could not change modes in basic...

You're probably right, but I think the rules might only address layer modes. Modes in the "Fade" tool may be a new thing with CS3.

Canon EF 24-105mm f/4.0L IS

01/12/2008 01:38:48 PM · #10

Originally posted by scalvert:

Originally posted by TooCool:
But I thought that you could not change modes in basic...

You're probably right, but I think the rules might only address layer modes. Modes in the "Fade" tool may be a new thing with CS3.

Not new, I have it CS.

scalvert

Canon EOS-5D Mark III

01/12/2008 01:40:27 PM · #11

Alrighty then, but I've never seen that particular issue come up for SC discussion.

01/12/2008 01:45:24 PM · #12

Originally posted by scalvert:

I just did a little playing in CS2, and the functionality of Edit>Fade with blend mode selection is present there as well. I don't have anything older available at the mo, so I can't say whether the capability is there in CS.

The fade command is available for most editing operations if performed immediately after the step. That includes pretty much everything under Image>Adjustments and under Filter. Both opacity and blend mode may be changed, and all blend modes are available in the drop-down.

AFAIK, changing the blend mode in the Edit>Fade command is a no-no. (ETA: a no-no in Basic, that is)

Message edited by author 2008-01-12 13:45:45.

Mr_Pants

SiPix Blink

01/12/2008 01:52:30 PM · #13

Originally posted by kirbic:

AFAIK, changing the blend mode in the Edit>Fade command is a no-no. (ETA: a no-no in Basic, that is)

Wasn't there an announcement to this effect?

fotomann_forever

01/12/2008 01:53:03 PM · #14

Originally posted by kirbic:

AFAIK, changing the blend mode in the Edit>Fade command is a no-no. (ETA: a no-no in Basic, that is)

I've seen it stated a few times in the forums that it's illegal, but don't ever remember a DQ based on that.

Oh, and edit > fade in other blending modes was present in PS7.

01/12/2008 01:55:41 PM · #15

Originally posted by fotomann_forever:

Oh, and edit > fade in other blending modes was present in PS7.

Thanks Leroy... I though it might have been, but no longer have 7.0 loaded anywhere.

Sony 24-70mm F4 Vario-Tessar T* FE OSS

01/12/2008 01:55:56 PM · #16

Originally posted by kirbic:

Originally posted by fotomann_forever:

Oh, and edit > fade in other blending modes was present in PS7.

Thanks Leroy... I thought it might have been, but no longer have 7.0 loaded anywhere.

Edit for typo

TooCool

Canon EOS-300D Rebel

Canon EF 50mm f/1.8 II

01/12/2008 01:57:57 PM · #17

Works in 6.0.

Bear_Music

Samsung Galaxy S24 Ultra

01/12/2008 01:59:43 PM · #18

Yes, edit/fade under a blend mode is illegal in basic. In basic you have to do it the long way, converting to Lab Color and then sharpening the luminosity layer and then reverting back to RGB mode. It's one of those lovely inconsistencies we have to live with :-) I was just discussing an easier way to do luminosity-channel sharpening, not advocating it for basic editing. But now I realize the THREAD is about LAB color in basic editing, so my bad :-)

R.