Cropping and DNG

[rolkar]

I am not sure how we treat cropping for DNG
Here is a discussion
http://www.dpreview.com/forums/post/56328304

In short - the poster wants us to really crop the image and not only use a crop meta data.

Is this what we do?

[erikrk]

Currently, the entire image is included in DNG and metadata is supplied
for cropping. It would of course be possible to do actual cropping
instead.

The question is, how much should we care about working around bugs in
various DNG processing software?

On lun, 2015-08-17 at 03:49 -0700, Roland Karlsson wrote:

I am not sure how we treat cropping for DNG
Here is a discussion
http://www.dpreview.com/forums/post/56328304

In short - the poster wants us to really crop the image and not only
use a crop meta data.

Is this what we do?

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Reply to this email directly or view it on GitHub.

[rolkar]

Currently, the entire image is included in DNG and metadata is supplied
for cropping. It would of course be possible to do actual cropping
instead.

That was my guess

The question is, how much should we care about working around bugs in
various DNG processing software?

That is a good question. There are some tools that it seems that several
potential "customers" like to use that implement DNG poorly.

Maybe the tools are buggy or simply implements a too old version.

As far as I understand, it is not only about cropping. Also the spatial
gain is using a new feature. Maybe also more.

[rolkar]

Ah! I do not remember this one!

One thing though. It seems like we set the cropping rectangle in meta data even if we have set the -no-crop switch, This is kind of wrong. At least it prevented me from using DNG for finding the positions of the AF dots for sd Quattro H.