Online PS Tutorial: Grade Seawater to a Fresh Light Blue

1 – Set up and make a selection

① Open Online PS (zaixianps.cc) and click File → Open to import your source image.

② Press Ctrl + J to duplicate the background layer; the new layer is called “Layer 1”.

③ Pick the Magic Wand tool (W) from the toolbar on the left and click once on the water.

④ To grow the selection, hold Shift while clicking further; to shrink it, hold Alt (Windows) / Option (macOS).

2 – Replace the colour

① Switch to the Color Replacement Brush in the toolbar on the left (B, inside the Brush tool group).

② Click the foreground colour swatch at the bottom of the toolbar to open the picker and set the colour:

• R: 26 G: 116 B: 163
• You can also paste or type the value straight into the #1A74A3 (hex) field.

③ Adjust the Color Replacement tool’s Size; [ (smaller) and ] (larger) are the quick way to change it.

④ Paint back and forth inside the water selection you made until the whole area is covered with the new blue.

3 – Change the blending mode and deselect

① When you have finished painting, make sure you are still on “Layer 1”. At the top of the Layers panel on the right, change the blending mode to Screen.

② Fine-tune Opacity and Fill as needed; 80%–95% usually gives a more natural pale blue.

③ Press Ctrl + D to deselect.