QuadCropper vs Perspective Crop Lens

This app contains a Photos extension to crop and deskew rectangles in a photo. Since the rectangles may be skewed by perspective, the cropping tool allows individual placement of the four corners of the 2D quadrilateral -- and then deskews the contained rectangle. This is useful for business cards or slides or book covers or the like which have been photographed at an angle. The app mimics the functionality of the Photos extension and can access the Photos library or the camera to get an image. One can also crop the image from any file. Unless the image is retrieved from the Photos library, the app will store the cropped image to a user-selected file. Corners can be nudged by tapping on the corner circles. The corner will move by a pixel in the direction of the quadrant of the circle that was tapped on.

Even if you intend to take a photo from the front, the image can be distorted due to the angle of the device or the camera lens. TV screens, exhibits, whiteboards, signboards, posters, documents, photos, blackboards, paintings, calligraphy works, timetables, smartphone screens, etc. Also, there are many cases where it is not possible to take pictures from directly in front due to physical constraints. From such perspective-distorted photos, you can quickly cut out only the necessary parts at right angles. Cuts out a free-form rectangle from a photo and generates a new rectangular image with right angles. The “Cropped Image View” allows you to enjoy working while seeing the results in real time. Moreover··· Conversely, you can also add a perspective effect to a monotonous photo. [Features] ・“Cropped Image View” that can be checked in real time ・Use the "Magnifying Glass" to fine-tune crop marks as you wish ・ Intuitive pinch operation for adjusting the aspect ratio ・Horizontal/vertical alignment between cutout marks is also informed by color. [Photo Source] ・Start the camera and take a photo ・Select photo from photo album ・Import shared files from other apps ・Paste photos copied from web images, etc. [Outputs] ・Image file storage: Photo album (camera roll) ・Image file sharing: AirDrop, LINE, Facebook, Dropbox, Instagram,...