你可以对格式的图像进行锐化或钝化，或改变颜色的深浅。

You can add edge enhancement or smoothness to a Jpeg, or vary the colour depth.

《柯林斯英汉双解大词典》

有时候，我用这个工具去锐化头发的细节，并且分散头发的颜色，可以使头发的颜色存在更多的明暗对比和变化，并且可以少用单一的颜色。

Sometimes I use this on hair to sharpen the details and disperse the colour which can be worked into the hair to give it more tones and variation, and less of a monochrome look.

youdao

有时候，我用这个工具去锐化头发的细节，并且分散头发的颜色，可以使头发的颜色存在更多的明暗对比和变化，并且可以少用单一的颜色。

Sometimes I use this on hair to sharpen the details and disperse the colour which can be worked into the hair to give it more tones and variation, and less of a monochrome look.

youdao