how to increase the photoshop sprite canvas width and height

Question

I am creating a sprite via photoshop and have run out of canvas width .However when i try to increase the canvas width all the positions of the icons in the css seem to go off . I am using the relative increase method .

How do i only increase the height without affecting the css positions of the current layers ?

score 2 · Accepted Answer · answered Apr 23 '12 at 11:09

Although this has nothing to do with programming (SO is about programming issues)

You need to click the top-left box from the anchor section of the canvas size, so that the expansion happens only on the right and bottom. This way the positioning of the current contents does not get altered..

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how to increase the photoshop sprite canvas width and height

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