Unverified50% confidenceFactExact time
Cloudflare默认将用户上传的PNG/JPEG图片转换为WebP格式以节省带宽，这一有损压缩过程会改变图像的DCT系数分布，可能使基于原始像素哈希的检测系统将转码版本识别为不同内容
1
Sources
50%
Confidence
Long-term
Relevance
7/9/2026
First Seen
Sources
Related Claims
UnverifiedThe core algorithm of JPEG image compression is the Discrete Cosine Transform (DCT); images are divided into 8×8 pixel blocks, and after each block undergoes a frequency-domain transform, high-frequency detail information is selectively discarded.69% similarUnverifiedPNG uses lossless compression based on DEFLATE and supports transparent channels, while JPEG uses lossy compression based on discrete cosine transform and does not support transparency66% similar
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