Various Topics on PHP

..n ..e..

(PHP4.3.4) Is it possible to change an image that's in one type (jpg, gif,
png) into another type? Especially, I know I can read a gif with GD2, but I
really need to be able to save it as a png. Is that possible?

-dg

..tthi.. ..k..

dan glenn schrieb:

> (PHP4.3.4) Is it possible to change an image that's in one type (jpg, gif,
> png) into another type? Especially, I know I can read a gif with GD2, but I
> really need to be able to save it as a png. Is that possible?

Why don't you just have a look at the do***entation?

http://www.php.net/manual/en/function.imagepng.php

Regards,
Matthias

.... ..ssa..

On Sat, 19 Jun 2004 07:13:48 GMT, "dan glenn" <dan_danboy@yahoo.com> wrote:

>(PHP4.3.4) Is it possible to change an image that's in one type (jpg, gif,
>png) into another type? Especially, I know I can read a gif with GD2, but I
>really need to be able to save it as a png. Is that possible?

Yes, it is.

--
Andy H***all <andy@andyh.co.uk> / Space: disk usage analysis tool
http://www.andyh.co.uk / http://www.andyhsoftware.co.uk/space

..u.. ..o..

"dan glenn" <dan_danboy@yahoo.com> wrote in message
news:MIRAc.74958$Im3.18399@newssvr29.news.prodigy. com...
> (PHP4.3.4) Is it possible to change an image that's in one type (jpg, gif,
> png) into another type? Especially, I know I can read a gif with GD2, but
I
> really need to be able to save it as a png. Is that possible?
>

You can convert gif into png or jpeg but no vice-versa. The imagepng() and
impagejpeg() will save the image into the respected format.

..n ..e..

"Chung Leong" <chernyshevsky@hotmail.com> wrote in message
news:xc2dnb2jItuK00ndRVn-vg@comcast.com...
> "dan glenn" <dan_danboy@yahoo.com> wrote in message
> news:MIRAc.74958$Im3.18399@newssvr29.news.prodigy. com...
> > (PHP4.3.4) Is it possible to change an image that's in one type (jpg,
gif,
> > png) into another type? Especially, I know I can read a gif with GD2,
but
> I
> > really need to be able to save it as a png. Is that possible?
> >
>
> You can convert gif into png or jpeg but no vice-versa. The imagepng() and
> impagejpeg() will save the image into the respected format.

OK - I'm now saving .gif's to .png's, but I note that I lose the
transparancy (if there is one) in doing so. How can I maintain the
transparancy in the PNG???

-dg

..u.. ..o..

"dan glenn" <dan_danboy@yahoo.com> wrote in message
news:UF2Bc.75569$1R7.72583@newssvr29.news.prodigy. com...
>
> "Chung Leong" <chernyshevsky@hotmail.com> wrote in message
> news:xc2dnb2jItuK00ndRVn-vg@comcast.com...
> > "dan glenn" <dan_danboy@yahoo.com> wrote in message
> > news:MIRAc.74958$Im3.18399@newssvr29.news.prodigy. com...
> > > (PHP4.3.4) Is it possible to change an image that's in one type (jpg,
> gif,
> > > png) into another type? Especially, I know I can read a gif with GD2,
> but
> > I
> > > really need to be able to save it as a png. Is that possible?
> > >
> >
> > You can convert gif into png or jpeg but no vice-versa. The imagepng()
and
> > impagejpeg() will save the image into the respected format.
>
> OK - I'm now saving .gif's to .png's, but I note that I lose the
> transparancy (if there is one) in doing so. How can I maintain the
> transparancy in the PNG???
>

Hmmm, I just tried it and it works correctly. I'm using 4.3.6. Maybe GD is
saving the PNG with alpha-channel info (which IE doesn't support) instead of
single color transparency. View the image in Netscape or open it with
Photoshop and see if transparency is there.

..n ..e..

"Chung Leong" <chernyshevsky@hotmail.com> wrote in message
news:ie2dnQO1r4AZRkndRVn-gg@comcast.com...
> "dan glenn" <dan_danboy@yahoo.com> wrote in message
> news:UF2Bc.75569$1R7.72583@newssvr29.news.prodigy. com...
> >
> > "Chung Leong" <chernyshevsky@hotmail.com> wrote in message
> > news:xc2dnb2jItuK00ndRVn-vg@comcast.com...
> > > "dan glenn" <dan_danboy@yahoo.com> wrote in message
> > > news:MIRAc.74958$Im3.18399@newssvr29.news.prodigy. com...
> > > > (PHP4.3.4) Is it possible to change an image that's in one type
(jpg,
> > gif,
> > > > png) into another type? Especially, I know I can read a gif with
GD2,
> > but
> > > I
> > > > really need to be able to save it as a png. Is that possible?
> > > >
> > >
> > > You can convert gif into png or jpeg but no vice-versa. The imagepng()
> and
> > > impagejpeg() will save the image into the respected format.
> >
> > OK - I'm now saving .gif's to .png's, but I note that I lose the
> > transparancy (if there is one) in doing so. How can I maintain the
> > transparancy in the PNG???
> >
>
> Hmmm, I just tried it and it works correctly. I'm using 4.3.6. Maybe GD is
> saving the PNG with alpha-channel info (which IE doesn't support) instead
of
> single color transparency. View the image in Netscape or open it with
> Photoshop and see if transparency is there.

Yes, you're right - the transparency is there. It was just IE. Gad. OK - is
there a way I can make imagepng() save the PNG as a palette-based (8-bit,
256-color) single-color transparancy? (These will work in IE, as they don't
use the alpha channel)