Re: [PHP] How to PHP get bit depth of a given PNG image file?

[Mattias Thorslund]

I think the documentation is a bit unclear about the fact that "colors" 
and "channels" are the same thing here. The line about bits should 
probably say "bits is the number of bits for each *channel*".


Mattias

On 06/15/2011 11:11 PM, Nam Gi VU wrote:

Thank you Mattias,

I'll look at `channels` again.

Regards,
Nam



On Thu, Jun 16, 2011 at 1:06 PM, Mattias Thorslundwrote:


On 06/15/2011 10:11 PM, Nam Gi VU wrote:


  Hi everyone,

In PHP code, given an .png image path, I need to detect the bit-depth of
that image. How can I do that?

I've tried to use getImageSize() and read the bits as below sample code
but
it always returns '8' for 24-bits/32-bits image.


Reading the manual, it says:

"
channels will be 3 for RGB pictures and 4 for CMYK pictures.
bits is the number of bits for each color.
"

So, to get the total bit depth, I think you need to multiply by the number
of colors, which is in the "channels" element.

Cheers,

Mattias


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Re: [PHP] How to PHP get bit depth of a given PNG image file?

[Nam Gi VU]

Thank you Mattias,

I'll look at `channels` again.

Regards,
Nam



On Thu, Jun 16, 2011 at 1:06 PM, Mattias Thorslund wrote:

> On 06/15/2011 10:11 PM, Nam Gi VU wrote:
>
>>  Hi everyone,
>>
>> In PHP code, given an .png image path, I need to detect the bit-depth of
>> that image. How can I do that?
>>
>> I've tried to use getImageSize() and read the bits as below sample code
>> but
>> it always returns '8' for 24-bits/32-bits image.
>>
>
> Reading the manual, it says:
>
> "
> channels will be 3 for RGB pictures and 4 for CMYK pictures.
> bits is the number of bits for each color.
> "
>
> So, to get the total bit depth, I think you need to multiply by the number
> of colors, which is in the "channels" element.
>
> Cheers,
>
> Mattias
>
>
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> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>

Re: [PHP] How to PHP get bit depth of a given PNG image file?

[Mattias Thorslund]

On 06/15/2011 10:11 PM, Nam Gi VU wrote:

  Hi everyone,

In PHP code, given an .png image path, I need to detect the bit-depth of
that image. How can I do that?

I've tried to use getImageSize() and read the bits as below sample code but
it always returns '8' for 24-bits/32-bits image.


Reading the manual, it says:

"
channels will be 3 for RGB pictures and 4 for CMYK pictures.
bits is the number of bits for each color.
"

So, to get the total bit depth, I think you need to multiply by the 
number of colors, which is in the "channels" element.


Cheers,

Mattias


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[PHP] How to PHP get bit depth of a given PNG image file?

[Nam Gi VU]

 Hi everyone,

In PHP code, given an .png image path, I need to detect the bit-depth of
that image. How can I do that?

I've tried to use getImageSize() and read the bits as below sample code but
it always returns '8' for 24-bits/32-bits image.

Please help.

class Utils {
//Ham de lay bits cua image

public static function getBits($image) {

$info = getImageSize($image);
return $info['bits'];


}
}

Hope to hear from all of you!
Regards,
Nam.

p.s I also post this issue on stackoverflow.com which is
here
.