Images
JPEG and GIF are supported by basically all handsets. PNG is supported by au and SoftBank handsets, and docomo i-mode browser 2.0 handsets.
Sizes
- depend on handset, but you can consider a width of 220px to be safe.
- docomo has more or less standardized on 240 px for the browser
- au has various sizes from 228px to 240 px
SoftBank has 2 major categories, the 230-240px and the large 468-480px browsers
Speedup tips
By specifying the image width and height inside the img tag, you can about double the page rendering speed on all carriers
- One large image will render faster than many small images. This effect is worst on docomo and softbank.
Image transcoding
Some ASP transcoding services that support Japanese handsets.
Fujifilm has complete solutions
docomo
au
