Image data scaling method, by calculating scaled brightness and color information as weighted average using weighting factors modified according to transparency information

摘要

Source image data contain brightness and/or color information, and also transparency information. The scaled image data also contain brightness/color information and transparency information. The called transparency information is calculated as a weighted average of the transparency information of the source image data. The transparency information of the source image data is used to determine modified weighting factors. The scaled brightness/color information is calculated as a weighted average of the brightness/color information of the source image data with weighting factors modified according to the transparency information.