Using the Perspective tab
Start on the Perspective tab in the Material Repeat tool, where you do the following:
- Identify the pattern.
- Check for straightness.
- Check that repeated items are parallel.
- Draw a boundary around the repeat
You use the Perspective tab to identify a rectangular region of the sample within the image. You can choose a rectangular region in the pattern itself, or a reference rectangle on the sample's mounting surface. The region you identify must be perfectly rectangular in the original sample, but may be distorted in the image due to the effect of perspective. In the image, the rectangle may be an irregular quadrilateral.
The Perspective tab corrects the image so the quadrilateral becomes a perfect rectangle whose sides are parallel to the horizontal or vertical directions of the image.
The Perspective tab does not apply any clipping to the image, because the rectangle you are defining does not represent the boundaries of the full-tile repeat. It simply adjusts the entire sample to correct the perspective.
To define the repeated area
- With the image open in the Material Repeat tool in Photoshop, click the Perspective tab.
- Click Axis Align to try auto-aligning the image.
- If you are not satisfied with the auto-aligning results, drag the sides of the rectangle to the perimeters of the sample to see if the edges are straight.
- Hold down the Ctrl key and drag a corner handle to rotate the rectangle until the pattern is straight.
- Find a point in the pattern where you can draw the boundary of the repeat while avoiding cutting through any major pattern elements (if possible).
![Step Info](assets/pers3.png) If you have trouble identifying the boundaries of the repeat, click the **[!UICONTROL Lighting]** tab and use the [!DNL Highlight Tile Edges] option to see how the pattern tiles. Manipulate the rectangle as follows:
- Uncheck the Lock Perspective checkbox to move the handles in any direction. When this option is checked, you can drag them only within the current perspective (which is flat, by default). If you change the perspective (by rotating) then recheck this option, the handles will be constrained to the new perspective.
- Hold down the Shift key while you drag a corner handle to move the entire rectangle.
- Hold down the Ctrl key while you drag a corner handle to rotate the rectangle about the opposite handle.
- When the perspective is correct you can move on to the Lighting tab.