For some weeks I am wondering why jpg files I save with Photoshop are extremly big like a 300 x 300 image is around 600 KB even when I reduce its quality all the way down to 0. Its all in RGB 8 Bit so thats not the problem is this a known bug? I am using Photoshop CS 5.5
Even when I create a blank white canvas its still more than 500 KB when saving as jpg
How can localize the problem better?
I uploaded the blank white image I created which is around 500 KB big could someone have a look at it?
Here is my short answer:
No, Its not a bug & you don't need to localize the problem.
JPG/JPEG & many other image formats commonly use lossy compression.
That means when you are looking at a jpeg/jpg file, its a compressed file with a lot of image data discarded & when they are rendered in Photoshop it gets reconstructed into a simple bitmap (an array holding 8 bits per color × 3 colors × width × height) which is larger in size than original file.
Also Photoshop allows you to re-sample images, add layers and they also account for increase in size
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