Participating Frequently

Question

JPG-Bild in 32 Bit-tiefe abspeichern

Forum|Forum|1 year ago
November 22, 2024
2 replies
767 views

Hallo zusammen

Ich scheitere gerade dran, ein Bild mit einer Bit-tiefe von 32 Bit als JPG abzuspeichern.

Ich habe Icons erstellt, die die Druckerei nun in der Grösse 2463x2463 px, 300 dpi und mit einer Bittiefe von 32 haben möchte. Nur kann ich diese in Photoshop nur max. mit 16 Bit als JPG abspeichern. Wenn ich das Bild dann nochmals öffne, ist es wieder auf 8 Bit.

Vielleicht noch zu erwähnen, die Ursprungsdatei ist eine Illustratordatei (vektor) aus der ich die JPGs dann geschrieben haben. Im Photoshop wollte ich nun die Bittiefe anpassen.

Was mache ich falsch?

P.S: Ich hab die neuste Photoshopversion.

Danke euch schon im Voraus.

LG

Nicole

macOS

This topic has been closed for replies.

jane-e

Community Expert

I'm currently failing to save an image with a bit depth of 32 bits as a JPG.
By @Nicole24412050vqbq

The JPEG format does not support 32 bits. If the print shop wants 32-bit, then they want another file format. Check with them.

Jane

N

Nicole24412050vqbqAuthor

Participating Frequently

Thank you for your answers. The way you explain it makes sense and is logical. 😄 I'll check with the print shop again.

davescm

Community Expert

When you talk to the printshop remember there are two ways to describe a file in bits. One is bits/channel and the other is total bits/pixel. Photoshop uses the former (i.e. bits/channel) some use the latter.

So an 8 bits/channel RGB jpeg file is the same as a 24 bit jpeg file.

Similarly an 8 bit/channel CMYK jpeg file is the same as a 32bit CMYK jpeg file.

Another you may come across with PNG files (not jpeg as jpegs don't support additional channels) is RGB 32 bits. That is still 8bits/channel but there is an extra channel for alpha. So in total four channels at 8 bits/channel is the same as a 32 bit RGB PNG file.

Wouldn't it be great if all software applications and files spoke the same 'language'

Dave

pixxxelschubser

Community Expert

I am pretty sure that your print shop wants a CMYK file with 32 bit colour depth. They definitely don't want a file with 4 × 32 bit/channel (that would be 128 bit colour depth)

Save the file with 8 bit/channel (= 32 bit colour depth) and send it to your print shop.
Best regards

Stephen Marsh

Community Expert

@pixxxelschubser

Most commonly expressed for RGBA(lpha), 4 x 8 BPC channels = 32 total.

So perhaps CMYK, 4 x 8-bit channels?

If so, it should be expressed as CMYK mode.

I doubt that they want CMYK 32-BPC = 128 total

pixxxelschubser

Community Expert

Hi @Stephen Marsh
We agree on that.
😉
That's exactly what I wrote:

… They definitely don't want a file with 4 × 32 bit/channel (that would be 128 bit colour depth) …

By @pixxxelschubser

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