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如何计算图片的内存大小 #43

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shichuanyang opened this issue Jan 27, 2022 · 2 comments
Open

如何计算图片的内存大小 #43

shichuanyang opened this issue Jan 27, 2022 · 2 comments

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@shichuanyang
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想请教下这个问题,
我先在用的是 CGImageGetHeight(image.CGImage) * CGImageGetBytesPerRow(image.CGImage); 好像不正确
@Rogue24
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Rogue24 commented Jan 27, 2022

@shichuanyang 图片的内存大小的计算是：图片的像素宽 * 图片的像素高 * 每个像素所占的字节数
totalByte = pw * ph * 4 一个像素占4个字节（ARPG）

@shichuanyang
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朋友 为何 pw * ph * 4 得出的结果 和把这行图片保存到相中的结果不一样呢

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@Rogue24 @shichuanyang