[PS] 自制彩虹/Create a rainbow

Today we are going to add a rainbow to this photo.

To begin with, choose the gradient tool, in gradient editor, choose "transparent rainbow" and linear gradient.

Add a new layer and fill the layer from left to right.

Filter > Distort > Shear

In the pop-up panel, adjust the shape of the rainbow. After finish, click "OK".

Press "Ctrl + T" to change the size of the rainbow and move it to a suitable position.

Add a layer mask.

Choose the gradient tool again, in the gradient editor, choose the "Black, White" color.

Apply it to the rainbow layer. After that, set the blending mode to "Screen" and opacity to 50% for better merge of the rainbow and the sky.

Copy the rainbow layer. In the copied layer, change the blending mode to normal and opacity to 15% to make small change to the rainbow color.

Finish.

元朗大棠紅葉之旅

踏入秋冬，楓香樹的綠葉會因氣溫下降而轉化爲紅色。每年的11月到12月，很多人選擇到元朗大棠郊野公園欣賞紅葉。若市民想乘坐公共交通工具前往大棠郊野公園，可以先乘搭西鐵到朗坪站，再乘坐港鐵巴士K66 在總站下車。

下車後沿著上山的方向一直走，約十來分鐘的腳程便到達大棠郊野公園的入口。

往楓香林的指示牌就在不遠處。

先要走一小段梯級。筆者保證，這數十梯級已是整個旅程最辛苦的一段路。

走畢梯級，頓有豁然開朗之感。圖片所見，大棠郊野公園佔地甚廣，郊遊設施充足，更附設停車處，因此吸引眾多人仕在假日前來郊遊、燒烤或帶同寵物前來遊玩。

 郊區火警訊號 - 提醒郊遊人仕不要留下火種和小心山火。

途經大棠自然教育徑的入口。

沿途偶爾看見遊人騎自行車上山。

不消30分鐘，筆者已到達目的地 - 楓香林。

林內人山人海，筆者花了很久也拍不到一張和楓香樹的合照。

順帶一提，香港的紅葉其實並非楓樹的楓葉，而是來自楓香樹。由於兩者的樹葉外形相近，且會在秋天變成紅色，所以香港紅葉常被誤為是來自楓樹。其實，楓葉一般為掌狀五裂，而楓香樹樹葉多為三裂掌狀，香港紅葉主要是楓香樹品種。

踏上歸途。

[PS]為風景照增加雲朵/Add clouds to landscape photos

Today we are going to add some clouds to this photo.

To begin with, add a photo with clouds above the background layer.

Go to the channel layer, press "Ctrl" and left click the red channel.

You will find that most of the clouds are selected.

Go to the layer channel, click "add layer mask". (the one highlighted)

You will see something like this. 

Use the brush tool to eliminate the clouds "in the river" and those covering the mountains.

[PS]快速為風景照增加人物/Keying Out Backgrounds(with layer mask)

Today we are going to key out the backgrounds by using the layer mask.

To begin with, add the photo and move it to a suitable position.

Select the figure using Magic Wand tool or other selection tool.

Select > Modify > feather, enter the value 2 then click "ok" to make the edge look better.

Go to the layer panel and click the button “Add Layer Mask” (the one highlighted)

Finish. You can further adjust the tone and color of the layer to better fit the background. (not shown in this tutorial)