Q：什麼是 pixel(畫素)？什麼是 ppi？什麼是 dpi？什麼是 lpi？什麼是圖檔 MEGA 數？
1.pixel-picture element-中文稱畫素，在電腦上表現圖像的基本元素：電腦裏的圖像就是由這些畫素集合組織而成的.數位影像中最直接最準確的單位就是pixel(畫素)它常見的計算方式例如：840*480 pixel，就可立即得知數位圖像的大小！
Decline At iStockphoto
If contributor attitudes as expressed on web forums are any indication iStockphoto is headed downhill fast. Most of the discussion seems to be taking place on the iStock official forum and at Microstock Group. In this article I’ll try to examine the issues and summarize some of the points being made by various contributors.