Is psd file format compressed?

nigelsmith · Posted: Wed Nov 17, 2004 6:38 am Post subject: Is psd file format compressed?

I came across the following on an Avid forum:

" don't use PSD files (their actually jpegs with some Adobe stuff added like layer info)."

Is this true? Cos jpeg is a lossy compression format, and I had always assumed that psd was at least as good as a tiff ie not lossy compression + additional layer info.

Can anyonw set me straight on this Confused

vel · Posted: Wed Nov 17, 2004 9:13 am Post subject:

psd, i believe saves just the file ur working on, jpegs lose quality and layers, so you're right

witam · Posted: Wed Nov 17, 2004 9:24 am Post subject: compression

On the adobe wesite we find this:

'Although compressed files generally have small file sizes, Photoshop may take longer to open or save them. With the exception of images saved in Photoshop format, Photoshop must decompress a file to open it and then recompress the file to save it. The BMP, CompuServe GIF, JPEG, Photoshop, Photoshop EPS, Photoshop PDF, and TIFF formats all can be saved with compression. In addition, Photoshop enables you to specify a compression method for TIFF layers in the TIFF Options window. You can improve performance by saving your file in compressed Photoshop format (a compression format in which there is no data loss) as you work, and then save your file in the format you want when you are finished editing the image.

To save an image without compression from Photoshop, choose File > Save As, select the format you want, and then select the "no compression" option in the format's Options dialog box. For example, select the TIFF format, and in the TIFF Options dialog box, select None for Image Compression. '

Hope this helps..

BryanDowning · Posted: Wed Nov 17, 2004 9:27 am Post subject:

You will never lose any quality whatsoever by saving as a .psd. To my knowledge there is no compression in a psd. I don't even think there are compression settings like there are in a tiff.

If you make something in photoshop and save it as a psd it will look exactly the same every time you reopen it. You shouldn't notice any quality loss. If you do come back here, and we'll let you know why Big Grin

BryanDowning · Posted: Wed Nov 17, 2004 9:29 am Post subject:

Oh cool. I didn't know there was compression for psd's. That's awesome. As that excerpt stated though you don't lose any quality either way, so why wouldn't you compress?

nigelsmith · Posted: Wed Nov 17, 2004 10:32 am Post subject:

Thanks for all the advice Big Wink

witam · Posted: Wed Nov 17, 2004 10:44 am Post subject: compression

It's our pleasure..

Oybro, This image will show you the compression:

BryanDowning · Posted: Wed Nov 17, 2004 11:43 am Post subject:

Goooooot it. Always great to learn something new. Good post witam! Big Grin

vel · Posted: Wed Nov 17, 2004 4:14 pm Post subject:

then how do u save so you have the ORIGINAL w/o any compression?

witam showed u cand with .psd Frown

TiDaL · Posted: Wed Nov 17, 2004 7:20 pm Post subject:

well thers an option on my phtosohop to save as "maximam size" or something of that sort when i saved as psd's is that a compression or what...

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