An exception: if you want to make a design that is not easy to do in just HTML/CSS, use Photoshop. Probably first.
HTML/CSS is the Blub of design. It's easy and holds your hand, but if you know how to design and know the medium Photoshop makes it easier to do things unimaginable by those working just within HTML/CSS.
So, please, feel free to not use Photoshop. For some, it'll work just fine.
(edit: I actually like to use Illustrator more, but a similar argument applies)
Comments
An exception: if you want to make a design that is not easy to do in just HTML/CSS, use Photoshop. Probably first.
HTML/CSS is the Blub of design. It's easy and holds your hand, but if you know how to design and know the medium Photoshop makes it easier to do things unimaginable by those working just within HTML/CSS.
So, please, feel free to not use Photoshop. For some, it'll work just fine.
(edit: I actually like to use Illustrator more, but a similar argument applies)