Photo numbering ON SX30/SX40 - Feature Requests - CHDK Forum
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Photo numbering ON SX30/SX40

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Offline BillBal

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Photo numbering ON SX30/SX40
« on: 09 / February / 2012, 16:15:14 »
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Having used an Olympus 740/750 for last 6 years, where each photo number included the month and date taken, the apparently random and meaningless numbers allocated by Canon are really frustrating!!  Any chance of providing significant photo numbering for the sx30 and sx40?
Thanks very much if that can be done.
BillBal
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Offline waterwingz

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Re: Photo numbering ON SX30/SX40
« Reply #1 on: 09 / February / 2012, 19:03:42 »
Quote from: BillBal on 09 / February / 2012, 16:15:14
Having used an Olympus 740/750 for last 6 years, where each photo number included the month and date taken, the apparently random and meaningless numbers allocated by Canon are really frustrating!!  Any chance of providing significant photo numbering for the sx30 and sx40?
It might be technically possible to implement with enough study of the Canon firmware and a little luck.  However that would certainly be a lot of work so would require somebody with the right skills who wanted the feature badly enough to spend a lot of time on it.  FWIW,  Nikon photo numbers are no better.
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Offline srsa_4c

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Re: Photo numbering ON SX30/SX40
« Reply #2 on: 09 / February / 2012, 19:38:55 »
Quote from: BillBal on 09 / February / 2012, 16:15:14
Any chance of providing significant photo numbering for the sx30 and sx40?

Quote from: waterwingz on 09 / February / 2012, 19:03:42
It might be technically possible to implement
It wouldn't be hard to implement: http://chdk.setepontos.com/index.php?topic=7366.0

But I don't think it's worth to mess with it. On DryOS, filenames are limited to 8+3 characters. Placing the files elsewhere OR giving them an unusual name would prevent the Canon firmware to find them.
Which means: no review on the camera.

I think it's better to rename the files based on their EXIF data - on a computer. There are various programs to do that.
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Offline waterwingz

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Re: Photo numbering ON SX30/SX40
« Reply #3 on: 09 / February / 2012, 19:57:42 »
Quote from: srsa_4c on 09 / February / 2012, 19:38:55
It wouldn't be hard to implement ..
Agreed,  but I guess the definition of "hard" varies with context. 

While maybe not technically difficult to implement,  the code posted in your wiki page link is tagged as "proof-of-concept".  Which suggests that perhaps many hours of additional work might be needed to get something working ?  That fits into the "hard" category to me considering the possible value of the change.
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Offline srsa_4c

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Re: Photo numbering ON SX30/SX40
« Reply #4 on: 09 / February / 2012, 21:14:23 »
Quote from: waterwingz on 09 / February / 2012, 19:57:42
the code posted in your wiki page link is tagged as "proof-of-concept".
Yes, because in its current form it's not useful at all. A real solution would be to create something useful out of it. If I wasn't clear enough: you can have the EXIF, you can have the JPEG, you can do anything with the file name. All you need is to find and intercept the Open() and possibly the Write() and Close() call(s) in that task.
The possibilities are:
- prevent writing to the card AND transfer the jpeg image over USB,
- modify the EXIF before writing,
- modify the file name / file path (if that would make any sense)

But this is a bit off-topic. For messing with the file name itself, it's not worth the trouble :)
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Offline BillBal

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Re: Photo numbering ON SX30/SX40
« Reply #5 on: 10 / February / 2012, 16:24:35 »
OK, thanks folks for throwing some grey cells at the problem!  I will follow the reference and see what "8+3" means, 'cos that sounds more than enough.
Your thoughts were appreciated.
BillBal
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Offline outslider

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Re: Photo numbering ON SX30/SX40
« Reply #6 on: 10 / February / 2012, 16:34:55 »
8+3 means that every file name has 8 characters of the name itself and 3 for extension. Eg. FILENAME.JPG

By 8 usually you can mean 'up to 8' to there is also possible name: FILE.JPG
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Offline fe50

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Re: Photo numbering ON SX30/SX40
« Reply #7 on: 11 / February / 2012, 04:29:12 »
BillBal - you may read a bit in the

"CIPA Design rule for Camera File system" :

* http://www.cipa.jp/english/hyoujunka/kikaku/pdf/DC-009-2010_E.pdf
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Offline BillBal

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Re: Photo numbering ON SX30/SX40
« Reply #8 on: 11 / February / 2012, 06:30:57 »
Duh . . Thanks, outslider - obvious when you know ::)  !  And also fe50, I'll check that out. Ta
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