DNG converter impact

[Orson]

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While converting the original DNG files from my Q2M , it seems that the file size is quite reduced.

Does this have any relevant visible impact on the IQ or dynamic range?

[01af]

vor 24 Minuten schrieb Orson:

Does this have any relevant visible impact on the image quality or dynamic range?

No, not at all.

Converting from DNG to DNG using the Adobe DNG Converter just applies lossless compression (and, if you wish, also adds fast-load data which is useful when working with Adobe Bridge or Lightroom). Lossless compression is truely lossless, hence no impact on image quality or dynamic range at all.

You also have the option to switch to lossy compression which will reduce the file size even more, and significantly so. It will have a minuscule impact on image quality and dynamic range but not visibly; you'd be really hard-pressed to actually detect any differences between lossless and lossy compression (besides file size).

[M11 for me]

vor 6 Stunden schrieb Orson:

While converting the original DNG files from my Q2M , it seems that the file size is quite reduced.

Does this have any relevant visible impact on the IQ or dynamic range?

Just as a matter of interest: How do you do that conversion DNG to DNG? And why (size reduction?)?

[Stephen_C]

10 hours ago, M11 for me said:

How do you do that conversion DNG to DNG?

Run DNGs from the camera through the Adbobe DNG Converter app (having, of course, selected lossless compressiom).

10 hours ago, M11 for me said:

And why (size reduction?)?

The size reduction (which also works with Q3 images) is useful in terms of maximising storage space (given that there is no loss of quality).

Stephen

[M11 for me]

Great. Thank you very much for that info.

[Guest]

Note that if you use Lightroom Classic you can also do the compression there, rather than using the standalone Adobe DNG Convertor app.

[M11 for me]

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vor 24 Minuten schrieb Corius:

Note that if you use Lightroom Classic you can also do the compression there, rather than using the standalone Adobe DNG Convertor app.

Thx. Hove about?

[Guest]

4 hours ago, M11 for me said:

Thx. Hove about?

Not sure what "Hove about" means

There are two methods:

1) Library -> Convert Photo to DNG

2) Metadata -> Update DNG Preview and metadata

The first will take any RAW files (including DNG) and allow you to compress it lossless or lossy.

The second will modify a file already in DNG format  and update the preview and metadata with the LRc edited values. e.g if you have made a B&W conversion, it will add a B&W preview. Lossless compression is a by-product of this so your Q2/Q3/m11 files will reduce in size as per option 1 above.

You would normally use the first method I think.

[jaapv]

You can also convert to DNG when importing in Bridge. But these options are really meant to be used for non-DNG files. 

[M11 for me]

Am 1.8.2023 um 23:35 schrieb Corius:

Not sure what "Hove about" means

Thank you anyway. You got my point 😇

I have tried it. The difference compared to the ooc DNGs is about a minus of 10%. This is something but not the big jump. Is that correct?

[M11 for me]

Am 2.8.2023 um 01:56 schrieb jaapv:

. . . But these options are really meant to be used for non-DNG files. 

That is probably the point. Will try with Canon RAWs to see if the difference is then >10% when converted compared to ooc CR2 or CR3.

[Stephen_C]

3 minutes ago, M11 for me said:

This is something but not the big jump. Is that correct?

Yes—there was a greater impact on Q2 images than there is on Q3 DNGs. It may be that Leica is doing more compression in-camera with the Q3. However, in my view, the saving is still worthwhile so I continue to use the lossless compression option of the Adobe DNG Converter on Q3 images.

Stephen