Photoshop - Crop tool

Thanh option của Crop tool (View > Options)

Crop ảnh theo kích thước cụ thể

• Chọn W x H x Resolution. Nhập kích thước (Ngang x Cao x Độ phân giải). Ví dụ 1920 x 1080 x 96 ppi.
• Sau đó drag vùng crop đến vị trí thích hợp

Crop ảnh theo khung hình hình vuông

• Chọn 1:1 (square).
• Drag góc vùng crop để scale
• Sau đó drag vùng crop đến vị trí thích hợp

Cách này cũng có thể áp cho các tỉ lệ khung hình khá như 4:5, 5:7, 2:3, 16:9

Crop ảnh mà giữ nguyên khung hình

• Chọn Original Ratio
• Drag góc vùng crop để scale
• Sau đó drag vùng crop đến vị trí thích hợp

Cách này cũng có thể áp cho các tỉ lệ khung hình khá như 4:5, 5:7, 2:3, 16:9

Crop ảnh theo tỉ lệ bất kỳ

• Chọn bố cục. Ví dụ 1/3 (Rules of thirds)
• Drag góc vùng crop để scale
• Sau đó drag vùng crop đến vị trí thích hợp

Crop ảnh theo bố cục

• Chọn Ratio. Nhập kích thước (Ngang x Cao). Ví dụ 1920 x 1080.
• Drag góc vùng crop để scale
• Sau đó drag vùng crop đến vị trí thích hợp

Cân chỉnh ảnh bị nghiêng

• Click công cụ Straighten trên thanh options
• Drag 1 đường thẳng theo đường nghiêng (mà mình muốn làm thẳng ngang). Ví dụ đường chân trời nghiêng

Nới rộng thêm ảnh

Trong trường hợp bố cục bị thiếu, bạn cần phải crop 1 vùng mà lớn hơn kích thước ảnh đang có. Hãy làm theo thứ tự như sau

• Kiểm chọn Content Aware
• Drag 1 vùng crop (có phần ra lấn ra ngoài khung hình) và Enter
• Psd sẽ tính toán thêm vào cho bạn vùng ảnh thêm vào. Nếu may mắn bạn sẽ có 1 kết quả ưng ý, nếu không thì bạn cần phải dặm thêm.

Cropping and straightening

The Crop Tool allows you to remove portions of your photo or image. Crops are non-destructive and can use specific aspect ratios as required.
Settings
The following settings can be adjusted from the context toolbar:

Apply—applies the crop to your image once you've defined the crop area (based on the positioned overlay).
Mode—sets the aspect ratio of the crop area. Select from the pop-up menu.
Crop dimension boxes—for Custom Ratio and Absolute Dimension modes, sets the width and height, respectively.
Units—sets the units used by the crop area.
Rotate—rotates the crop area by 180°.
Straighten—switches to Straighten mode to align crooked photos horizontally or vertically.
Overlay—offers various overlays for better photo composition.
Reset—resets all settings to their defaults.
Darken Border—renders areas outside of the crop boundary darker for easier previewing.

Cropping removes unwanted areas of your image for either practical reasons or better composition. Straightening simply means correcting a crooked image.
About cropping
Use cropping for practical reasons or aesthetic reasons equally. For instance, an unwanted object or person can be excluded which might otherwise detract from your desired image. Aesthetically, you can balance image content in your composition so that it is more appealing to the eye.

Affinity Photo lets you crop unconstrained or to original or custom aspect ratios. For print or web delivery, you can specify common print sizes (e.g., 6" x 4") or create pixel-accurate custom crop regions, respectively.

If snapping is active, the crop area can snap to page edges and guides when being resized or moved.

Original
Portrait
Straightened
16x9
Absolute
6x4

The Crop Tool affects the entire canvas, which is typically the native dimensions of an opened image. When a crop is applied, the regions outside the drawn crop area will be hidden. However, cropping is non-destructive, which means you can uncrop your image at a later date.
Crop modes
When cropping, you may wish to work unconstrained or to specific ratios or absolute dimensions. These are some of the options available:

Unconstrained—The crop area can be sized freely.
Original Ratio—Retains your image's original aspect ratio.
Custom Ratio—Uses the adjacent input boxes to set the ratio—width in the left box, height in the right box. Can be saved as a preset.
Absolute Dimensions—Use the adjacent input boxes to set absolute dimensions for the crop area. Set your Units if needed. Can be saved as a preset.
Presets—A combination of commonly used, and custom saved, presets are presented for ease of use.
Straighten mode
When activated, dragging on the page will orient the photo to align it with the drawn line. We recommend using a reference within your photo such as the horizon or the edge of a building.

Compositional overlays
If you're cropping to remove unwanted subject matter in your image, compositional overlays can be ignored. However, if you're looking for better composition, one of several overlays can be used.

Thirds Grid—Shown by default, the Rule of Thirds grid's intersection lines can be positioned over an object of interest in your image.
Golden Spiral—Size and position the grid so the inner origin of the spiral is centered over the subject of interest; this balances the composition naturally. Also known as Fibonacci Spiral or divine proportions.
Diagonals—Position two objects of interest under the diagonal line intersections to balance the objects against each other.
You can quickly toggle between these overlays by pressing O.
To crop an image:From the Tools panel on the left, select the Crop Tool.
From the context toolbar, select a crop mode from the Mode pop-up menu.
Adjust the context toolbar settings.
Drag a corner or edge handle on the grid to reposition the grid to suit.
From the context toolbar, click Apply.To uncrop the cropped image:From the Document menu, click Unclip Canvas. To straighten an image:From the Tools panel on the left, select the Crop Tool.
From the context toolbar, select Straighten.
Drag on the image to define the new alignment.
From the context toolbar, click Apply.To save crop settings as a preset:Adjust the context toolbar settings.
From the context toolbar, click the Mode pop-up menu and select Add Preset.
Type a name for the crop preset, then click OK.
The new preset will appear at the bottom of the Mode pop-up menu.To delete a crop preset:From the context toolbar, click the Mode pop-up menu and select the preset you wish to delete.
Click the Mode pop-up menu again and select Delete Preset.