Image hex-code generator Ver.1 on 2 computers (Mac) doesn't give the same result

Both Mac are runing under Big Sur with the same Acrobat version, and the problem was already the same with the previous OS before updating.

Here the ratio of the number of characters is x2.4, but with a 60x60 px image the ratio is x2.133 (28800 and 61440 characters), so the scale is not the same...

These calculations are done by both Mac from a single same file including the same image.

The script is:

var myIcon=getField("Button1").buttonGetIcon();
var w=getField("iconWidth").value;
var h=getField("iconHeight").value;
var mult;
if (w>=h) mult=w;
else mult=h;
var size=(w*h*8)+(mult*32);
var streamIcon=util.iconStreamFromIcon(myIcon);
this.createDataObject("heximg.txt", "");
var oFile=this.getDataObjectContents("heximg.txt");
oFile=util.streamFromString(streamIcon.read(size), "utf-8");
this.setDataObjectContents("heximg.txt", oFile);

I don't understand neither the mult variable nor the *32, and I guess in (w*h*8) 8 is corresponding to 8 octets for 1 bit.

I don't understand how a single script doesn't give the same results on both computers, unless that comes from a special Acobat setting.

@110714, about your htlm page, is it free?

Thanks

Then again, a 20x20 pixel image has 400 pixels. Hex images in Acrobat are in ARGB format. That's 1, 2 digit hex number per pixel, or 8 digits which = 3200 characters.  

 7680 characters means you have 960 pixels. The the image is scaled up. Check the size parameters for the converted icon. 

I don't know the specifics for the Mac, but on the PC there was a major change (in a DC verision update) in how images are imported to a button field, i.e. the imported images are automatically scaled, which reduces the number of pixels.  This is probably what you are seeing. 

The solution is to do the hex conversion outside of Acrobat. I wrote a simple HTML page using the Canvas object to do it. 

Do both computer have the same hardware and software specs? Do both computers have the same version  update of Adobe Acrobat ?