实数a，b在数轴上的位置如图所示，则化简\sqrt{（a - 1）^{2}}-\sqrt{（a - b）^{2}}+|b - 2|的结果是多少？---**Chart Description:** * **Type:** Number Line. * **Main Elements:** * A horizontal line representing a number line. * An arrow on the right end of the line indicating the positive direction. * Tick marks are present at integer positions from -2 to 3. * Labels for the integer positions are below the tick marks: -2, -1, 0, 1, 2, 3. * Two points are marked on the number line as black dots. * Point labeled 'a' is a black dot located at the tick mark corresponding to -1. Above this point is the label 'a'. * Point labeled 'b' is a black dot located at the tick mark corresponding to 2. Above this point is the label 'b'. **Note:** The image only contains the number line diagram with points 'a' and 'b' labeled. The question stem, options, or any other context are not provided in this image. Based on the diagram, point 'a' is at -1 and point 'b' is at 2.