Image size on new files

I've recently purchased a new machine with windows vista and loaded on CS3 photoshop (which is new to me).
My problem is when I open a new file it's huge.
I set the size to a simple A4 and resolution 150 pixels/inch but the image size is 3.24M before I even start. I've done various tests by bringing in old images I created and they do come in at original size, it's just new files. I've gone through all the settings and everything looks normal.
I'm really stuck with this one.

Until you save there is no file size. The scratch file size used by Photoshop is not directly controllable. It includes history items, layers, etc., in addition to image data. The image data for an image that is, for example, 1000px x 1500px (i.e., ~1.5 megapixel), will be about 4.5 MB uncompressed in RGB 8 bit per channel (i.e., 24 bit) format. The same image, in an uncompressed RGB 16 bit per channel (48 bit) format, will take up about 9 MB. This is the full image data as used within Photoshop, and determines the size reflected in the Info screen (after being modified to account for history, layers, masks, etc.). When you save the file, it will likely be much smaller, unless you intentionally choose an uncompressed TIFF format. A compressed TIFF file will save considerable space if it's an 8-bit image. GIF (which allows only 256 distinct colors) is an appropriate format for very small images (such as thumbnails) and text/line art, and saves a huge amount of space. JPEG is used for the final version of photographic images, and it saves considerable space over the original due to compression, but its compression is lossy, PNG has the potential to trump many of these formats, because it can accommodate 16-bit images, allows for transparency, and it is lossless, but it is not fully compatible with some existing web browsers (i.e., IE6).

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I am pasting the code below
public static void main(String[] args) {
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I am working on a IEEE paper where in I am supposed to achieve a better compression ratios as compared to current JPEG standards. So if only loading and displaying the image results in size reduction and quality too, how do I go ahead with my algorithmI suggest you:
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(b) acquire some basic knowledge about JPEG before you attempt to improve on it, and
(c) learn to quote accurately. Otherwise your paper will be refereed out of existence. I didn't say anything about 'loading and displaying the image resulting in size reduction and quality too'. I said 'loading and storing'; and 'change the contents', not 'size reduction and quality too'.
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post some code ... with code tags
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Hi All, I've created a mono, bitmapped image approx 400px square.
Then saved the file.
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Many thanks, RP

I'm sure that the TIFF file and Photoshop "Image Size" are both 19 KB by coincidence. The "Image Size" is the number of bytes consumed by the uncompressed pixel data. A TIFF file has to contain a header, so the image data in the file will be compressed then the file header will be bringing the file's total size to 19 KB.
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New Image Size and Resolution in CC

Hi there.
Ok, maybe i'm missing something, but how do i reduce the ppi's of a given image in the Photoshop CC? Changing it in the image size, in the Resolution field, it acomplish nothing. It logs an entry in the History panel, but nothing changes in the picture. Did Adobe changed how this works, or it's just a bug?
Thank you.

Try setting to real-world measurement, like inches or cm.
Hi Charles, i think that change in cm/mm/in it's the only way to change the image ppi (in my case save/resample it to 108ppi). Can you confirm that this is correct?
Anyway when i go to image size (new panel of CC) the w/h are:
1) grey and always set in pixel with resample flagged.
2) always set in inches with resample NON-flagged (also if my ruler unit is in Pixel).
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In CS6 and CC i never seen w/h in percent - where is my error?
Many thanks!

Image size on new files

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