
88 GOOGLE APPS HACKS
If in doubt about which image type to choose, try going for PNG rst and check whether the image
le size is acceptable; if the image ends up below 40 KB, for instance, this will do ne for most
purposes. If the PNG ends up being too large, try to save as JPEG instead and compare le sizes.
Some of Google’s presentation themes use background images, like the Grass or Rustic themes. Although
these images aren’t dramatically big, if you want to ne-tune your presentation for best performance, you can
also use a theme that doesn’t use a background image.
There are different ways to resize an image, and to reduce its colors (useful for the PNG and GIF
formats). Note that the terminology for these varies from one image editor to the next, but the
underlying approaches are similar.
Sometimes when downsizing the resolution of a photo, you are
offered to resize it, or to resample it. Resampling returns smoother results, as it “merges” the colors
of adjacent pixels. It may only be offered in your photo editor if the image you are working on uses
more than 256 colors; convert your image to a high-color format rst if that’s not the case. After
resampling, you can decrease the amount of colors again before saving.
When you reduce the number of colors for an image, your photo
retouching ...