Size of Image in RAM

Scott Rossi scott at
Wed Feb 8 00:35:41 EST 2017

You say the mode is 8 bit.  I might be wrong, but I don’t believe JPEG supports 8 bit (256 color) images.  Even if it does technically, the format is not really intended for 8 bit images, but rather 16 bit or higher.

When I generate an 8 bit indexed color image in Photoshop and look at the Save As menu, JPEG is not an option.  If I instead choose Save for Web which allows saving as JPEG, the resulting image re-opens in Photoshop in RGB (24 bit color) mode.

So as I read question, you’re getting a 24 bit image because you’re saving in JPEG format.

If you really want to save as 8 bit color, use PNG or GIF.


Scott Rossi 
Creative Director 
Tactile Media, UX/UI Design 

> On Feb 7, 2017, at 7:45 PM, Sannyasin Brahmanathaswami via use-livecode <use-livecode at> wrote:
> I'm trying to optimize for Mobile.  Photoshop is playing tricks on me
> given a 38K  jpg;
> rect 3 X 5
> 552px w
> 736 px h
> 72 dpi (irrelevant for screen)
> Open in Photoshop: it indicates 1.16M in RAM, but mode is 8 bit… but
> but the online calculation sites for file size for that rect/bit-depth should make it only take up 398k or so, in RAM.
> If I change the online calculator for that rect to "24 bit" it returns the exactly size  (1.16M) I'm seeing in photoshop…roughly 3X the size of the 8 bit, which is what we would expect.
> So
> 1) Why is Photoshop reporting the files size as if it were 24 bit? and
> 2) Does LC have a function to check the size of an image in terms of RAM consumed? I couldn't find one in the dictionary.
> BR  (thinking about affinity these days!)
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