The following summarizes the 4 Ge everyday use PS tips, we want to help (key recommendation of the first little skill)
Scene One: measuring PS the PSD elements in the figures hours tall wide, general use manual 
measurement, but in fact there is a shortcut key, as in FIG.
Moving tool elements with the respective selected layer and Ctrl + T , will enter the mode shown in the arrow (esc press the cancel mode) , while the element information panel displays a high value width
Scene Two: If you want to change the PSD size, such as UI to the PSD width of 750px , you want to change 640px ,
Image - the image size is set to bring up the width and height of the window, and then automatically adjusts to your desired size by more than column
Scene Three: When you open the PS , found in the toolbar on the left and right of the layer regions are hidden, as shown below
The left side of the toolbar: Select Window - Toolbar to bring up the toolbar on the left
Layer the right area: select - Layer bring up the right side of the display layer (PSD must be a prerequisite for the job, if your design is to PNG, is not selected layers)
Scene Four: how to view the design on gradient color elements?
移动工具 
选中按钮元素，然后会出现右边箭头所指的渐变叠加，双击后在出现的图层样式界面单击红色框区域，
最后在弹出的渐变编辑器界面点击红色框区域小倒三角即可（从左往右点倒三角）
注：有时即使采用上述方法也无法获取到渐变颜色，后咨询UI妹纸，她建议针对不复杂的渐变颜色（一般2种渐变色）
可用吸管工具直接从元素的最顶部和最底部区域吸取颜色，亲测好用