The Calca app is a tool that will allow you to transfer any image from your device or captured with your camera to paper. Your device will act as a camera lucida or a projector.
**How does it work?
You will need a stand, such as a glass, a jar, a box, or you can purchase one that suits your needs. I recommend some on my website, calcaapp.com.
**Select an image.
You can do this from your camera, search for one on the internet, take a screenshot or select one you already have on your device. It can be a photo, a drawing, a text, a sketch, as long as it is an image file.
Then, you will go to the tracing area, where you must give permission to your device's camera to be able to see through it and the selected image the area where you are going to draw. Hence the 'projector' effect. You can adjust the opacity by means of a sliding bar at the bottom, until you get the most comfortable result to start tracing. The zoom and rotation of the image can be controlled with your fingers. In addition, the camera zoom can be adjusted via a slider bar at the bottom. You will also be able to use a grid, which I have found to be a better option than cropping the image, as many devices were causing errors. However, you can make your suggestions in the relevant section.
**Note:** There is an option where the camera, image and grid are modified together with your fingers. Its rotation should be avoided, as when the whole camera is rotated, the movements of the stylus, hand, etc., do not match those seen on the device. Therefore, there is an option to lock the rotation, although it may be an adventure to try.
**Note:** Your device MUST FOCUS ON THE DRAWING AREA, be it paper, wall, floor, etc., FOR PROPER FUNCTIONING, AVOID PASSING YOUR HAND BETWEEN THE DRAWING AREA AND THE DEVICE.
You can draw on paper, yes, but you can also make a small mural on the wall if you hold the phone upright and look through it at the image you have chosen on the wall.
You can also use a basic stand to support the device at a 45-degree tilt or whatever you choose, and you can make a 3D effect on the drawing. There are examples with videos and images in the help section.
**Important:**
- This app is not magic. It needs practice, there are demonstration videos to see results.
- You can search the internet for any drawing to colour and start practising.
- You can remove advertising with a point system and at no cost.
- You can remove advertising with an annual subscription.
- It does not project the image. You need a projector for this.
- To avoid autofocus, you must prevent your hand from passing under the camera. This is explained with pictures in the help blog.
- You don't need to register for the app, you can download sample images from a secure cloud folder or search for any image you want on the internet.
- This app is under continuous development, comments and suggestions are welcome at apliarte.com.
It is important and necessary to use a support, such as a glass, a jar, a box or the ones I recommend in the TRICKS AND TIPS section, in the "about" section.
You can draw on a piece of paper, yes, but you can also make a small mural on the wall if you hold the phone upright and look through it at the image you have chosen on the wall.
I'd appreciate your feedback to see if I'm doing it right or if I need to improve.
Thanks for using my app.