Using the color-level tool to make a normal photo into a colorful nostalgic photo, note that all the parameters involved are for reference only. Or the old saying, see less parameters, more practice methods.
After the first step to copy the layer, in order to get the dark angle effect, using the Polygon lasso tool, 50 pixels to select the middle area, the ctrl+shift+i.
The second step is to click on the "Create new adjustment and fill Layer" button below the layers panel to point the excellent order tool.
The third step to the right to pull the middle slider, feel the dark angle of the appropriate.
Step Fourth Click on the "Create new adjustment and fill Layer" button, point excellent step panel, in the red channel, set the parameters below (for reference only):
Fifth step do not turn off the color Level Panel, continue, point out the green channel, set parameters.
The sixth step continues, points out the blue channel, sets the parameter, the parameter setting here is lets the picture appear slightly a layer of blue tone, in order to highlight the nostalgic feeling.
The last step-stamped layer (Ctrl + Alt + Shift + E) gets Layer 2 and is sharpened appropriately. According to their own aesthetic preferences to practice, "parameter is a reference, the most important method!"