If you use filters too frequently and wish to quickly preview and apply more than one filter at a time, try the "Filter Gallery". It is magical I However, totake advantage of it, you need to upgrade to Adobe Photoshop CS2 as the previous versions don't have this feature integrated. The "Filter Gallery" appears under the "Filter" menu. If you go to the "Filter Gallery" instead of applying filters, you will preview multiple filters before applying them.

The filters are listed under various categories such as artistic, brush stroke, distort, sketch, stylize and texture as found under the "Filter" menu. To preview a filter, you just need to expand any category and click on the filter you wish to preview. The parameters of the filters can be adjusted using the sliders to the right.
To preview multiple filters:



•First, add a new effect layer by clicking on the "New effect layer" button appearing below the list of effect layers next to the "Delete effect layer" button.
•Click on the effect layer added
and make it visible by checking its checkbox. The icon of an eye appears when an effect layer is visible.
•On selecting a new filter, it will get applied over the previous filter allowing you to view the combined effect of two filters.
•To preview individual filters, hide all the effect layers apart from the one you wish to preview. Unchecking an effect layer will hide it.
After you're satisfied with the effects, click on the "OK" button to apply the selected filters.