how can i save pixel changes in image?

amira hl

2015 6 8

1 个回答

回答已采纳

7 次查看（30 天）

0 个投票

i made pixel value changes in an image , then i save it in a new name, then i wanted to use the new in another code, i checked the pixel values and

rgbValues2 =

232 240 253

rgbValues1 =

10 240 253

pixelvalue =

182 194 208

redvalue =

182

why is that?? shouldn't be the pixelvalue=10 240 253??

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Follow Question

采纳的回答

David Young 2015-6-8

0 个投票

Could be because JPEG compression loses information, so a write followed by a read only returns an approximation to the original. Try using a lossless format, such as BMP, instead of JPEG.

Also, do you need to write the image out to a file and read it back anyway? It's usually much more efficient simply to pass the image between functions or scripts in memory, using the name of the variable that refers to it.