PSD size blow-out

BM
Posted By
Bran_MacEachaidh
Oct 15, 2003
Views
238
Replies
3
Status
Closed
Folks,
Fairly new to PS7 and wondering what I’ve done to cause the following. Suggestions and remedies very welcome, please ! 😉

I have an original piece of b&w line art which I have scanned, auto-traced and saved as an 8-bit PNG. It makes a file 17.6 Kb in size.

I then open this in PS7 and save it as a PSD, single layer only, choosing the background colour (white) as transparent.

The PSD is 24.3 Mb !

Ummm… what have I done ?!
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CW
Colin_Walls
Oct 15, 2003
How big is the image in pixels?
DM
Don_McCahill
Oct 15, 2003
A PNG format compresses data. PSD does not, and allows for many other things like layers, paths, etc. Even if you don’t use these, some overhead for them has to be loaded. It is not unusual for files to be 10, 100 or even 1000 times larger in PSD format than in a compressed file format.

You will be able to make the file small again by saving it back to PNG.
L
LenHewitt
Oct 15, 2003
Bran,

which I have scanned, auto-traced and saved as an 8-bit PNG. <<

Auto-traced in what? And why, having converted to vector by tracing, do you then save as PNG converting it BACK to a raster format? You might just as well save the original scan as PNG…….there is no point in auto-tracing if you then save as a raster format.

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