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Based on the results obtained by spectrophotometer measurements, the gamut volumes of ICC standard rendering intents were calculated with the Convhulln function in MATLAB. At the same time the visual evaluations were adopted to evaluate the output image quality. The data analysis in relation to the results of visual evaluations shows the difference influence of the rending intents to digital image quality and the insufficient of using chroma to evaluate the image quality. The results can be significant for explaining the relationships of gamut volume, rendering intent and the image quality in digital printing and for the scientific evaluation to image quality.