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Nowadays, digital watermark algorithms are widely applied to ownership protection and tampering detection of digital images. A new blind watermark algorithm for color image is proposed in this paper. In the algorithm, the original color image is transformed from RGB to the YUV color space. Arnold transform is employed for constructing the watermark to increase the security. The secure image adaptive watermark is then embedded into low-frequency coefficients of the original image by modifying Discrete Integer Wavelet Transform. (DIWT) The detection and extraction procedure is a blind, i.e., it does not need the original image. Only those who have the key can detect and extract the right watermark, which makes the approach have high security level. Both theoretical analysis and experimental results demonstrate that this algorithm can achieve good perceptual invisibility and security.