Why image compression information is different on the method used

The size of the new image is 72 dpi @ size 1280x800px resolution.

The final output settings target when using "Save for Web" in Photoshop should be:

resolution of 72 dpi @ 1280x800px dimension

JPEG quality: 75 @ 246,7 kilobytes.

1. If I re - upload the image which is supposed to be 246,7 kilobytes in Photoshop, then click on the image size.

He told me that the image is 2.93 MB.

2. If you use Apple app 'Preview' and click the Inspector he tells me that the image is 253 KB (kilobytes).

3. When you use the 'Quick look' feature of Apple, by selecting the image and then press space bar, he tells me that the image is 247KO

(rounded) parameters of 246,7 kilobytes of output which is closer to the original final goal.

4. Finally, when I click on order I for the information of the image, it tells me it is 253 bytes or (254 KB on disk).

Why all these news image available so different and what method do I use or trust?

Hi Choiceimport,

Don't sweat the little things. The subtle differences between preview, Quicklook and command-i are due to a variety of things such as sectors how this program could look to get all the data. Some programs cantilevered sector reading. One area where you will see really is if you have saved your image is 253 kb and when you put it in a mail client, it might be (and I do this number upward) 370 KB.

The big problem, that is why it is so big in PS. To understand this, we must remember that JPEG images are compressed in a lossy format. There are two types of compression here, frozen appearance (because the format actually loses information (ergo with loss), so that more compression, more data is removed and thrown (never to return) and General format compression algorithms.) For example, the file has a size of storage 247KO (or about), but when it is developed, so it can be seen is 2.93 MB. How much is the PS must take care in what concerns the ram to work with the image but not its storage size.

And FWIW, I specifically call on "storage size" by referring to the size of the document is on the hard disk, as opposed to the size of the image that is (for me) refers to the dimensions of the image (either MPXL or X pixels wide by Y pixels maximum).

Tags: Photoshop

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