Mailinglist Archive: opensuse (1367 mails)

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Re: [opensuse] Writing coments on photos problem - yes, again! O:-)
On 02/01/2016 05:24 PM, Carlos E. R. wrote:
I can not generate the exact JPG the camera would have generated.
For instance, a NEF typically has 20 MB. The corresponding JPG generated
by the camera has 10 MB. The JPG generated by shotwell is only 2 or 3 MB.

They are different JPG, generated differently. I want to have both and
decide which to use at use time. Not close doors in advance.

Again, I think you're missing the point.

The camera uses the same algorithms every time, no variation.
A photoeditor can do variations, as I've said, masking and more.

My personal opinion is that that the images I've seen generated for
those 'defaults' are not to my taste, but then I'm a Brit, and just as I
think British loudspeakers sound 'right' and the Japanese one sound too
"brassy", I think the colour vibrancy of the Japanese jpgs is all wrong.
That's me. YMMV.

The size of a RAW file is pretty much fixed, its a dump of the sensor,
Bit by bit.
The size of any jpg is going to vary A LOT depending on a number of
things. Its size - as in dimensions, 10x8 vs 4x6 vs "wallet size" vs
"poster size". Its also based on run-length encoding so a large area of
monochrome will be coded smaller than a graded or multicolour surface.
A jpg is 'lossy', and that loss can occur in many different ways. it is
also compressed. It _could_ even be a compression of the bit image,
although that seems wasteful given there are other ways to encode arrays
of bits - run-length being one of them.

The whole point of converting RAW to JPG is that it opens doors.
An almost infinite number of them.

Example: one of my areas of interest is macro photography of flowers.
The city has many gardens and their contents change though the year.
The are plant societies that hold events and competitions. Its a rich
area. My cameras have "plant/macro" scene settings. Early on I did
what you are claiming. The results ended up that about 0.5% of the time
I kept the camera generated JPG. Even then, the version I edited from
the RAW using Darktable was much more satisfactory. The only reason I
could possibly think of for RAW+JPG is the need to immediately post to
social media, as Bob pointed out. I haven't hit that and don't foresee it.

I think you're grasping at straws here.



--
A: Yes.
> Q: Are you sure?
>> A: Because it reverses the logical flow of conversation.
>>> Q: Why is top posting frowned upon?

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