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PostPosted: Tue Nov 27, 2007 7:00 pm 
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Hi:

I have the camera set to Large/Fine and on a 1Gig Sandisk UltraII card I can get 204 photos.

When I look at some of the reviews they say they can get 260 with the same settings on a 1Gig card.

All I did was get a new card, pop it in the camera and formatted it. Was I suppose to format it on my PC?

Thanks,

Mitch

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Panasonic Lumix DMC-ZS3 (Lumix DMC-TZ7)


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PostPosted: Tue Nov 27, 2007 7:30 pm 
I don't remember were I've read this - I hope I'm recalling correctly - but it seems that the Canon jpeg algorithm is efficient in a way that you don't always get the same size in megabytes for each image, but rather the smallest size in bytes that the algorithm can produce. That is to say, for "complex" images, you get a bigger file size than for "simple" ones.

So the camera is giving you a conservative estimate based on your available card space. It can't predict how your next 200 photos are going to be like. It's thinking in the way of you using the most "complex" images, thus resulting in bigger files.

If I recall correctly, this is not true for Nikon, when all jpegs have, for the same horizontal x vertical size in pixels, have the same size in bytes.

To see if what I said is real, take two photos in jpeg, with the same horizontal x vertical dimensions in pixels: one photo of a white wall (with a small object for the camera to focus on) and another photo that is more "complex", such as the hair of a person (or grass at close range, or a pile of small objects with different textures and colours).

With your Canon, you will get two different file sizes, thus answering you question. :)

PS: Actually, if this is true, then the Canon jpeg algorithm is efficient (read: correct) while the Nikon jpeg algorithm is inefficient (read: incorrect, not compliant with the jpeg standard)!


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PostPosted: Tue Nov 27, 2007 8:00 pm 
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Joined: Sat Nov 03, 2007 6:48 pm
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Luis,

Thanks for the info, let me explain some more.

I formatted the card in the camera, and the lcd displays 204 photos can be stored.

I am not taking 204 photos and the card is full, I am basing it on the lcd readout.

Thanks.

Mitch

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Panasonic Lumix DMC-ZS3 (Lumix DMC-TZ7)


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PostPosted: Wed Nov 28, 2007 8:22 am 
luis wrote:
If I recall correctly, this is not true for Nikon, when all jpegs have, for the same horizontal x vertical size in pixels, have the same size in bytes.


I get different file sizes for every shot I take with my Nikon.


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