This is a follow-up to my previous post on vignetting corrections with the M9, here. In that post I said that I was working on a new version of CornerFix that would address the issues that I had identified. That new version is out now, as version 1.3.0.0, and can be downloaded from Sourceforge here.

4

Thomas Lester has posted on how he's using dcpTool here, describing it as a "fantastic tool". He shows some some great example images of how the hue twists in some of the Adobe camera profiles can result in really unnatural skin tones, and how to avoid the problem by using dcpTool.

There's been a lot discussion on the Leica User Forum about problems with vignetting correction on the new M9.

3

I've posted a camera profile and some reference images for the M9 on the ChromaSoft website. They're at the bottom of this page.

The most important file is the DNG camera profile, generated from a real image of a real GM24 chart using Adobe's Profile Editor.

6

A recent discussion over on the Leica User Forum got me to finally finish writing this.

39

dcpTool, and the whole Adobe hue twist story been getting some attention on various forums, primarily with respect to skin tone rendition with the Canon 5DII - at least some people have found that untwisted and/or invariate profiles are giving them better colors than the usual Adobe profiles.

One of the pleasures of writing imaging software is that you occasionally get to see some really stunning images that were processed through your software.

David Ryan has just published some images that I think are just great.

4

So I tested V1.0.0.1 of CornerFix on Windows 7, and guess what - it broke. Specifically, while images were converted, corrected, etc, they weren't displayed.

A little digging around showed that Microsoft, in their wisdom, have changed the behavior of the .Net 2 Picturebox control.

So I've been lazy about blogging, and productive about writing software. Since I last blogged about software releases, I've released not one, but two new open source applications, keychainDD and pcdtojpeg.

2

So, after a long break due to work pressures, back to the CG Pipelines and CIContext Bugs issue.

What I ended up doing was to modify my application to allow me to build a test image, and then assign any profile that I wanted to that image, and to any of the subsequent stages.

So, I've been starting to build a simple soft-proofing application for Mac OS X. the concept being something simple that could take a TIFF or JPEG as input, then show what the rendering would be, and where any out-of-gamut colors were for any given output profile. E.g., a printer or whatever.

In this post, I'll look at the renderings of the various Adobe DNG profiles on a profile by profile basis.

If you haven't taken a look at Part 1 of this, I'd strongly suggest you do - it's there that I set the scene for these charts, and talk about how to interpret them. Part two is here.

7

In this post, I'll look at the renderings of the various Adobe DNG profiles on a color by color basis.

If you haven't taken a look at Part 1 of this, I'd strongly suggest you do - it's there that I set the scene for these charts, and talk about how to interpret them.

A complete digression, but for anyone struggling with the fact that the Apple CIAnnotation sample doesn't work under Leopard (OS X 10.5), the biggest problem seems to be in the CITextLayer.m module, where the graphics context is not restored.

1

In previous posts, I've talked about DNG Camera Profiles, and the "hue twists" that Adobe put them in order to get "pleasing" color. "Pleasing" in this context has, as far as I can gather from Adobe's various comments on the subjects, at least two aspects to it.

dcpTool V1.1 is out - a little sooner than I'd been expecting to update it.

2

There's been a conversation on the Adobe forums about some unexpected changes in tint when the recover and exposure controls are used in Adobe Camera Raw (ACR), and presumably in Lightroom as well.

10

As mentioned in a previous post, getting dcpTool out the door was a little bit of a problem.

dcpTool is hosted on SourceForge. Previously I've uploaded project web content without any problem, for CornerFix and tnefDD, using SFTP via Cyberduck, which is a neat OS X FTP client.

dcpTool did indeed ship out yesterday:

dcpTool is a compiler/decompiler for DNG camera profiles (DCP files), as used by Photoshop, Camera Raw and Lightroom.

The new version of CornerFix (V1.0.0.0) is out. This has:

1. Lens definitions for new Leica lenses

2. Fixes some minor memory leaks in the Mac version

3. Updates the Windows version to VC 2008 - that brings with it some advantages as regards how Vista does its UAC.

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Author of AccuRaw, PhotoRaw, CornerFix, pcdMagic, pcdtojpeg, dcpTool, WinDat Opener and occasional photographer....
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