Datatypes with os3.1

[amiga4001]

I installed 3.1 on my 1200 and with it toolmanager and newicons.
I wanted to put a picture in the background.
Just a simple cartoonwallpaper as .iff with not too much colours as the 1200 has only a 030.
Downloaded some pictures on the pegasos and converted them to .iff and resized them to the amigascreensize(640x512).
But amiga won't display them not as iff or as original jpg.
Why??I thought it had these datatypes in os 3.1?
Or am I missing something?

[jmbattle]

May I ask what happens when you attempt to select the image for use as a background?  If Multiview is also unable to show the image, it is perhaps a problem with the file format - datatypes can be a little fussy at times.

Try opening and re-saving the file in an Amiga paint program such as PPaint.

Kind regards,
James
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[Thomas]

Workbench 3.1 originally comes only with a picture datatype class for IFF pictures. And it does only support palette-based IFF pictures, not 24bit-ILBMs.

If you want to use JPEG pictures, you have to install a third-party datatype class for JPEG pictures. Check the util/dtype directory of Aminet.

Some datatype classes need a new version of picture.datatype (V43), for example the excellent ak datatypes. If you don't have a graphics card, get the Picasso96 archive from Aminet, unpack it and replace sys:classes/datatypes/picture.datatype by the one from the Picasso96 archive. Do *not* install the other files from the archive.

There is also an updated ilbm datatye on Aminet which allows to load 24bit iff pictures.

Bye,
Thomas

[amiga4001]

Thanks for the help.
I installed the picture datatype from P96.
Also installed newer ilbm datatype(24 bit support) and I installed the ak datatypes.
All pictures are shown now.
Now I must convert the pictures from jpg to 8bit's iff.
Think this is fastest way to show on the 1200?
I have some graphical programs but no experience in this.
I have Adpro which I do a exute and the a render to raw after this it allows me to save it as 24bit or 8 bit.
But imagecouring is very poor doesn't look like 256 colours actually.
Also have FXpaint iff it can perform such actions.
Or is there a nice aminet tool for this?

[jmbattle]

Again, PPaint's internal JPEG loader does a reasonably good job of downsampling 24bit images to 8bit - just ensure that Floyd-Steinberg dithering is selected in the preferences.

Cheers,
James
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