GIF (GIF87, GIF89) format image

Vicente García

Hi,

I have a problem, I am working with Visual Basic and I need to save a image
in GIF format but Visual Studio always save the file in GIF89 format and I
must save the image in GIF87 format. May anyone please tell me how I could
save the image in GIF87 format or how I could convert a image format to
GIF87?

Thanks in advance

May 28 '07 #1

Subscribe Reply

4444

Andrew Christiansen

The .NET Framework uses system registered image codecs to encode and decode
images. The framework is using the codec which encodes GIFs in GIF89
format. I don't belive there is one available which encodes in GIF87. You
may need to lookup the GIF87 specification and write the encoder yourself
(which would be a lot of work).

- Andrew

"Vicente García" <nu********@hot mail.comwrote in message
news:O4******** *****@TK2MSFTNG P05.phx.gbl...

Hi,

I have a problem, I am working with Visual Basic and I need to save a
image in GIF format but Visual Studio always save the file in GIF89 format
and I must save the image in GIF87 format. May anyone please tell me how I
could save the image in GIF87 format or how I could convert a image format
to GIF87?

Thanks in advance

May 29 '07 #2

Vicente García

Many thanks,

I have found ImageMagick, it has a console programa "convert" so I can
convert gif to gif87. It is not the best solution but it works

Thanks,regards!

"Andrew Christiansen" <wh******@gmail .comescribió en el mensaje
news:O6******** ******@TK2MSFTN GP05.phx.gbl...

The .NET Framework uses system registered image codecs to encode and
decode images. The framework is using the codec which encodes GIFs in
GIF89 format. I don't belive there is one available which encodes in
GIF87. You may need to lookup the GIF87 specification and write the
encoder yourself (which would be a lot of work).

- Andrew

"Vicente García" <nu********@hot mail.comwrote in message
news:O4******** *****@TK2MSFTNG P05.phx.gbl...
>Hi,

I have a problem, I am working with Visual Basic and I need to save a
image in GIF format but Visual Studio always save the file in GIF89
format and I must save the image in GIF87 format. May anyone please tell
me how I could save the image in GIF87 format or how I could convert a
image format to GIF87?

Thanks in advance

May 30 '07 #3

Terje

Vicente García wrote:

Hi,

I have a problem, I am working with Visual Basic and I need to save a image
in GIF format but Visual Studio always save the file in GIF89 format and I
must save the image in GIF87 format. May anyone please tell me how I could
save the image in GIF87 format or how I could convert a image format to
GIF87?

I'm curious, why do you have to save the gif files as GIF87a? The GIF89a
version basically introduced features like storing several images in a
single file (animated gif) and *extension blocks*, like comments. In
these blocks it's possible to store copyright information etc. The image
data itself is pretty much the same thing in these two GIF versions. I
don't think there are any compability issues between them . Anyway,
there's no software in use today that can't read and display both versions.

terje

May 30 '07 #4

Vicente García

Hi,

First of all, sorry for my bad English. I must do it because the software in
which the images are going to be read is very old, (on an Unix machine) and
I haven't permission to update the software because of compatibility issues.

Regards

"Terje" <fa**@usenet.no escribió en el mensaje
news:5c******** *****@mid.indiv idual.net...

Vicente García wrote:
>Hi,

I have a problem, I am working with Visual Basic and I need to save a
image in GIF format but Visual Studio always save the file in GIF89
format and I must save the image in GIF87 format. May anyone please tell
me how I could save the image in GIF87 format or how I could convert a
image format to GIF87?

I'm curious, why do you have to save the gif files as GIF87a? The GIF89a
version basically introduced features like storing several images in a
single file (animated gif) and *extension blocks*, like comments. In these
blocks it's possible to store copyright information etc. The image data
itself is pretty much the same thing in these two GIF versions. I don't
think there are any compability issues between them . Anyway, there's no
software in use today that can't read and display both versions.

terje

May 30 '07 #5

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