Changing Rectangular Image to triangula

[justx007]

Hi,
I am a newbie here. I have a rectangular image of a color spectrum. I would like to change it to a triangular shaped spectrum so that it looks like the spectrum coming out of a glass prism.
How can it be done?

 

[apepp]

...try out the warp feature on the placed image in illustrator...

...effect menu > warp > arch and then adjust the horizontal or vertical to 100%...

...it may be better for quality to apply your own gradient to a rectangle and then rasterize it to the size required, unless your image is already of adequate quality to warp...

...to raster an object can be found under object > rasterize...

...a full color spectrum can be found under the swatches palette flyout menu (top right), scroll down to 'open swatch library' > gradients > spectrums...

Andrew

 

[apepp]

...the alternative is to distort it in photoshop first...

Andrew

 

[apepp]

...to do that, you need to control + T the layer, then grab a top corner handle, hold down control + shift + alt and drag inward, to a point...

Andrew

 

[apepp]

...forgot to mention...

...if your only layer says 'background' double click the layer with the alt/option key, this will unlock it to a layer...

...also an additional way, by way of warp, in photoshop is to command + T a layer in photoshop, then right click and select 'warp', in the tool bar you also have warp options, change to 'arc'...

...bend to zero %...

...H to zero %...

...and V to minus 100%...


Andrew

 

[apepp]

...yes, my first post was talking about illustrator, until i realised i wasn't in the illustrator forum...

...daft...

...but in any case, that would be one way in illustrator, if it was the only program one had...

Andrew