Some Help needed...

osmond19 · 26th June 2003

Hi guys, I currently own a Canon A70 Camera. I realise one problem with my camera. For instance, if I'm using the highest resolution (L) and Superfine compression on my 16MB Compact Flash, the number of pictures I can take show 9. After I take one pic, the number reduces to 8. If I take another shot again, by right the number should reduce to 7 but it didn't. I remain at 8. Only I took another pic, then it will reduce to 7.

At first, I thought maybe my compact flash to faulty so I change to another Compact flash, the same problem occurs. So I decide to take a look at the size of the image file. The size of the image ranges from as low as 800KB to 1.3MB but actually to the manual the estimated size of the photo should be abt 1.56MB. Is my camera faulty? Why isnt the image that it took arent around the size that is stated in the user manual???

Thanx for reading, your help is appreciated!

Larry · 26th June 2003

if i not wrong, file sizes vary with with image, depending on the image since JPEG uses a compression algorithm to reduce the size. so images with a lot of areas with the same colour/tone would be smaller than a image with a lot of very fine details.

that's my understanding anyway. if you shoot RAW or TIFF, then it should all be consistently the same file size. try it?

djchris · 26th June 2003

Quote:

Originally posted by Larry
if i not wrong, file sizes vary with with image, depending on the image since JPEG uses a compression algorithm to reduce the size. so images with a lot of areas with the same colour/tone would be smaller than a image with a lot of very fine details.

that's my understanding anyway. if you shoot RAW or TIFF, then it should all be consistently the same file size. try it?

He doesn't have raw and tiff to play with...

Anyway, try shooting a white wall and another shot at something contrasty and see the difference in filesize.

osmond19 · 26th June 2003

ya i tried shooting at different things, e size varies. so i guess it's normal huh?

meng · 26th June 2003

nothing to panic about.
that's why it's stated estimated in the manaul

Azure · 26th June 2003

Yes, the sizes vary. Apparently the amount of Reds/Greens/Blues in the picture has some impact on the size. Suggest that you take it as an estimate of 1Mb per image. You may also want to note that less greenery in the picture will usually lead to a smaller size.

MeNaCeWu · 28th June 2003

Nothing to worry abt... my A40 also did the same thing. With my 64mb CF empty, it says 64 shots left. The camera estimates 1mb per pic, but actually it takes 90 odd shots to empty my CF...

Jason Ho · 28th June 2003

Thread moved to Canon subforum.

osmond19 · 28th June 2003

thanx guys!

26th June 2003	#1
osmond19 Member Join Date: Apr 2003 Location: "Long Hill" town Posts: 150	Some Help needed... Hi guys, I currently own a Canon A70 Camera. I realise one problem with my camera. For instance, if I'm using the highest resolution (L) and Superfine compression on my 16MB Compact Flash, the number of pictures I can take show 9. After I take one pic, the number reduces to 8. If I take another shot again, by right the number should reduce to 7 but it didn't. I remain at 8. Only I took another pic, then it will reduce to 7. At first, I thought maybe my compact flash to faulty so I change to another Compact flash, the same problem occurs. So I decide to take a look at the size of the image file. The size of the image ranges from as low as 800KB to 1.3MB but actually to the manual the estimated size of the photo should be abt 1.56MB. Is my camera faulty? Why isnt the image that it took arent around the size that is stated in the user manual??? Thanx for reading, your help is appreciated!

26th June 2003	#2
Larry Moderator Join Date: Apr 2002 Location: singapore Posts: 6,097	if i not wrong, file sizes vary with with image, depending on the image since JPEG uses a compression algorithm to reduce the size. so images with a lot of areas with the same colour/tone would be smaller than a image with a lot of very fine details. that's my understanding anyway. if you shoot RAW or TIFF, then it should all be consistently the same file size. try it?

26th June 2003	#5
meng Member Join Date: Apr 2003 Posts: 1,282	nothing to panic about. that's why it's stated estimated in the manaul

26th June 2003	#6
Azure Deregistered Join Date: Mar 2003 Location: ClubSNAP community Posts: 2,783	Yes, the sizes vary. Apparently the amount of Reds/Greens/Blues in the picture has some impact on the size. Suggest that you take it as an estimate of 1Mb per image. You may also want to note that less greenery in the picture will usually lead to a smaller size.

28th June 2003	#7
MeNaCeWu Member Join Date: Aug 2002 Location: Clementi Posts: 361	Nothing to worry abt... my A40 also did the same thing. With my 64mb CF empty, it says 64 shots left. The camera estimates 1mb per pic, but actually it takes 90 odd shots to empty my CF...

28th June 2003	#8
Jason Ho Senior Member Join Date: Jan 2002 Posts: 2,312	Thread moved to Canon subforum.