Preserved Topic: PSD Format

Ok... some say that the file size is reduced if you hide all layers. This could not be true because the file size depends on the amount of data stored in the psd. So it shouldn't matter if you hide or show a layer

Yah, I just checked this out, and found what prompted that discussion. Here's what happens, the default save option has a few things turned 'on', one of them something like "save image thumbnail". It's kind of like saving the image twice sometimes, and if this is checked your file could be 50-100% *bigger*. If this option is checked and you "save thumbnail" with all the layers turned off, it will of course be a picture of nothing and so the file size gets smaller that way, too.

You can find this option under "Preferences/Saving Files", look for "Image Previews", that should be set to "Never Save". This has got to be a 'must' for transfering PSD's with PSpong matches, no doubt!

Your pal, -doc-



[This message has been edited by DocOzone (edited 12-06-2001).]

First off - it was I that said that the file sizes would be reduced if layers were hidden.


Image above is an example of a 7 layer psd document ( i reduced the size to show all the layers)
Document is 500 pixels wide and 353 pixels high at a resolution of 72dpi


the screen shot above shows the file sizes of

* aac1.psd - 4,170KB (layers can be seen - thumbnail can be seen)
* aac1-hide.psd - 3,686KB (layers cannot be seen - thumbnail can be seen)
* aac1-hide-no thumb.psd - 3,685KB (layers cannot be seen - thumbnail cannot be seen)
* aac1-no thumb.psd - 4,167KB (layers can be seen - thumbnail cannot be seen)

You can try it with almost any document - I generally have one layer "on" and the thumbnail on so that i can see the files properties before opening it (I have a knack of giving my psd files stupid names not related to the actual pic).

I only mentioned the fact because it works for me...i can see that it is reduced...maybe its different per computer due to "file saving" settings.

It was only a hint...especially for Photoshop Pong. The huge files being downloaded all the time.

Anyways - Later all

Minks

ps: sorry for the stir but why not try it..then tell me if it works for you...i'd love to understand why it wouldn't


I try to take just one day at a time but lately several days have attacked me at once !

Maybe it would be smarter to create links too - to see how i did it

* aac1.psd - 4,170KB (layers can be seen - thumbnail can be seen)
* aac1-hide.psd - 3,686KB (layers cannot be seen - thumbnail can be seen)
* aac1-hide-no-thumb.psd - 3,685KB (layers cannot be seen - thumbnail cannot be seen)
* aac1-no-thumb.psd - 4,167KB (layers can be seen - thumbnail cannot be seen)


I try to take just one day at a time but lately several days have attacked me at once !

Edit: darn links

[This message has been edited by Minkies (edited 12-06-2001).]

Actually, I got that report from someone else too, it seemed odd, but did work the first time I tried it. Still, it was a pain for me, not knowing which layers should turned 'on' or off, I typically have a few hidden layers for 'just in case', so it can be awkward to save in a way I wasn't needing next time around! I just checked this again on Windows with PS6, and I get the same results you did, with windows the saving from not saving the thumbnail is minor, much different from the mac, hmm...

perspective3_layersOn_thumbOn.psd - 3832 KB
perspective3_layersOn_thumbOff_Mac.psd - 2596 KB
perspective3_layersOn_thumbOff.psd - 3380 KB
perspective3_layersOff_thumbOn.psd - 2573 KB

I won't bother with thumbnails, they're all the same image from my bout with DL-44 in PSpong. I'll keep playing and see if I can find a setting that will allow me to save files efficiently with windows, and my layers 'on', it seems like it should be possible!


Your pal, -doc-

My understanding of this, was that the file size with layers on is bigger due to the preview image, not the thumbnail image. (preview image is what shows up when the psd is placed into another program like quark)

Me Again?

Either way, the file size is reduced. So, it's a matter of what's more conveneint for you - making layers invisble each time or just setting your preferences to not save the preveiw.....

moving your (one-color) background layer to the top may help if you want to reduce filesize without turning the layers off.

edit: i cannt zpel.



[This message has been edited by mahjqa (edited 12-07-2001).]