- It's best to scan images as RGB colour at 72-150dpi PSD format, then crop it, resize it then re-save it as a different name. This results in richer colours
- To clean up your images, use a dust/filter tool and rubber stamp/cloning tool in your photo editing program then sharpen the image
- JPEG = Joint Photographic Experts Group
- GIF = Graphics Interchange Format
- PNG = Portable Network Graphics
- Baseline Standard is the most common form of JPEG
- Baseline Optimised uses a better compression technique but may not be supported on earlier browsers
- Progressive allows your JPEG image to appear as though it's coming into focus as it downloads on your webpage
- Adobe Image Ready allows you to visually compare various JPEG compressions
Images and web-safe colours
Although 256 colours are enough to fool the human eye into thinking it can see more, it does pose some problems in displaying colours outside of the 256 colour gamut. As a result it is quite possible your JPEG images may appear 'dithered' or 'speckled' on older computers. To make matters worse Macintosh operating systems and Windows operating systems use a different set of 256 colours. Most are identical, however 40 of them are different leaving you with only 216 colours to work with. In your swatch pallet in Photoshop, click on the black triangle to see the 'Wide Spectrum' palette. It is best to stick to the 216 colours in web design.
Another way of selecting web-safe colours is through the use of your Colour Picker. Double click on either colour swatch in your palette, tick the box that says 'Only Web-safe Colours'.
GIF's support a variety of special effects including interlacing, transparency and animation.
No comments:
Post a Comment