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Old Jul 10, 2004, 3:38 AM   #1
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I took lots of pictures with the FZ10. when checking the file size, some of the picture has about 950KB and some has about 1.5MB. all the settings were the same. Is this normal?
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Old Jul 10, 2004, 5:06 AM   #2
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That's normal for a Jpeg file, one picture can be more compressed than another. A picture with lots of detail and different colors will be larger than a picture of a white wall or a blue sky.
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Old Jul 10, 2004, 11:08 PM   #3
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but 900KB for a 4MP at full resolution, I think my camera is defected.
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Old Jul 10, 2004, 11:51 PM   #4
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No, your camera is fine, it's the Jpeg compression as explained above.

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Old Jul 10, 2004, 11:59 PM   #5
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pnphan wrote:
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but 900KB for a 4MP at full resolution, I think my camera is defected.
Your camera is not defective!

As Klaas has already mentioned it depends on the amount of detail and range of colours contained in the image.

I have some image files at even lower file sizes than you mentioned, the scene is of a river with greyish buildings in the background and a large area of sky.

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Old Jul 11, 2004, 12:13 AM   #6
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thanks
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Old Jul 11, 2004, 3:48 AM   #7
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Also if you rotated any images to a vertical format that can affect the file size. There are free lossless rotation programs available.

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Old Jul 11, 2004, 3:07 PM   #8
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yes, i know that
Using Ulead Photo Impact to rotate the image helps in retain the image quality.
I guess panasonic just compress the image way too much.
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Old Jul 20, 2004, 10:48 PM   #9
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No, Panasonic does not compress the image too much. The FZ10 pictures look great, with no noticeable compression.

Just because one of your files is 900kb does not mean that Panasonic has compressed the image too much. As others have tried to explain, this is a feature of the jpg file format. Some pictures of equal resolution will have vastly different file sizes and still all look fine. It just depends on what's in the picture.

Let me explain it this way. Imagine you laid outa bunch ofphotographs on your dining room table. Now a friend walks in the room wearing a blindfold, and you have to DESCRIBE each photograph to your friend. The only way your friend can "see" the photos is through the words you use to describe the photos. This is going to take a lot of words to describe all those photos, right?

Now imagine the same game, only this time quite a few of the photos are identical. Every time you get to one of the identical photos, it takes very few words to describe it because you can just say "this one is identical to that other one I was telling you about."

The jpg format works the same way. Instead of having to store complete information about every pixel, if there are a lot of pixels that are identical, it saves a lot of file space by just saying "same as that other one". Also, in the case of pixels that are similar but not identical, rather than store a complete description of the pixel it takes less file space to just say "this pixel is 4 clicks more blue than the last one".

So, a picture with an awful lot of similar pictures... say a picture with a lot of blue sky... requires less file space than a very complex picture with lots variety in it. Yet both have the same resolution and quality.

Someone please correct me if I am wrong.
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Old Jul 21, 2004, 1:49 AM   #10
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Jim Zim wrote:
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No, Panasonic does not compress the image too much. The FZ10 pictures look great, with no noticeable compression.

I agree only if you don't make large blowups. A true SHQ JPG of a 4Mp image would be over 3Mb. You are losing something with the high compression even if you consider 1.5Mb to be a more average shot. Pictures from my 4Mp Pentax S4 average about 2.7Mb, and they don't even consider that SHQ. You always lose a little with higher compression.
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