Bit depth Rate

Forum|Forum|8 years ago
November 2, 2017
3 replies
804 views

Hello everyone, i have been using Photoshop for a while but currently im studying graphic design and for an assignment the teacher ask me to export a picture in different type of files like .jpg, .gif, .png and so on that part i get. But then he ask us to export it in 1bit, 8 bit and 24 bit and thats where comes my question.
How do you export it in 24 bit, i though that 24 bit was the same as 8bit since (8 bit per channel makes 24 bit per pixel). Is there something im missing?
I would love some help on this matter
Thanks in advance.

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davescm

Community Expert

There are two types of 8 bit he could be referring to :

1. 8 bit which uses a pallete - so that you get a maximum of 256 different colours in the image. GIF and PNG-8 work that way.

2. A version not often see now which used 3 bits for red , 3 bits for green and 2 bits for blue. It was mainly used on early computer screens.

I suspect he is referring to the former.

Dave

DanielfeoAuthor

Participant

Thanks for your answer, it helped a lot. I think i know what i will do now

gener7

Community Expert

This is where the confusion lies: BPC vs BPP

The 'bit depth' setting when editing RGB images, specifies the number of bits used for each color channel – bits per channel (BPC). This means that the 8-bit setting (BPC) is in fact 24-bits per pixel (BPP). ... Similarly the 16-bit setting (BPC) would result in 48-bits per pixel (BPP).

For further reference: Understanding Photoshop color modes

Gene