3.PREAMBLE TO THE DESCRIPTION COMPLETE SPECIFICATION:
The following specification particularly describes the invention and the manner it is to be performed
FIELD OF INVENTION:
The present invention mainly relates to. "DEVELOPMENT OF CHANGEABLE MULTI COLOUR PRINTS IN COTTON FABRIC USING PHOTO CHROMIC DYES"
Background of the inventions:
Programmable matter that has the ability to change its physical properties (color) holds the promise of a future in which objects will re-configure themselves according to a user's needs. One aspect of programmable matter is color, which would allow objects to change their appearance repeatedly. For instance, in clothing, accessories' could be altered to match the main outfit and textiles could be recoloured for different events in the same day.
We can create changeable of multi-colour fabric from a single fabric.
(a) We mixed CMY photochromic dyes together to create our multi-colour ink.
(b) After coating the object, we use
(c) a UV light source and a projector to control each colour channel on a pixel-by-pixel basis, resulting in high-resolution multi colour textures that can be reapplied multiple times.
Photochromic dyes can transform from a transparent to a coloured state through the absorption of UV light ('activation'), and transform back from coloured to transparent through the ('deactivation'). When cyan, magenta, and yellow photochromic colours are mixed together into a single solution and the solution is activated with UV light (i.e., all three colour channels are fully saturated), the resulting colour is black. This is consistent with the CMY colour chart the centre of the chart, which shows the result of all three colour channels in full saturation is black.
Summary of the invention:
The development has a large scope of using a single piece of fabric we can make the re-programmable different colour prints using photochromic dyes. By this invention people can wear the cloths with different colour prints on the same day. This method reduces the wastage of dyes and do not affect environment. This would be slightly expensive but in upcoming days it would cost friendly.
DETAILED DESCRIPTION OF THE INVENTION:
1-AppIying a Virtual Texture to a FABRIC
After placing the fabric onto the rotating platform, users load the corresponding fabric into the 3D editor Blender. Next, users apply a virtual texture to the digital model using Blender's texture mapping tools Clicking on the 'Preview' button converts the texture to the closest match realizable with the available photochromic colour space. To compute this preview true and compute the deactivation times for each pixel. We estimate the resulting physical colour by calculating and then load the newly computed texture onto the fabric. The user can toggle between the virtual and the preview texture, adjusting colours as required.
2- Transferring the Texture onto the FABRIC
When users hit the 'transfer texture' button, our custom python plug-in for Blender handles the projection mapping. Our system first generates four ray traced projection images by virtually rotating the fabric model in 90° increments to reach all four sides of the object. The plug-in then sends the projection images to a Processing application (via the OSC protocol) that generates the deactivation animations. To create the deactivation animations, the Processing application converts the colour Values of eacn pixel in the Projection images into deactivation times for each of the projector's R, G, B colour channels. It then computes the optimal deactivation times for each pixel using our optimization algorithm. Our implementation generates this animation in 5-25 seconds per view depending on the size of the object.
To begin the projection sequence, users hit the 'Activation' button to activate the photochromic coating on the object. The rotating platform turns 360° in 10 steps. Users then press the 'Projection' button to apply the computed R, G, B animations that deactivate the colour channels on a per-pixel basis to create the desired colour texture. Once the projection on one side of the object is complete, the platform rotates the object by 90° and repeats this process until all the sides have on the object's shape and the texture being applied (up to 45min per side).
3- Colours onto the fabric to achieve the desired fabric texture.
When projecting a texture onto the fabric from several sides, parts of the object may be projected onto multiple times. To compensate for this, we compare the intersection points of each ray on the object to the intersection points of all other views. If a hit point is closer than the projected pixel size , we set this pixel to black, removing any projection on this area.
The more a surface is slanted, the less light from the projector will hit each target pixel on the surface. As a result, the same deactivating time will reduce saturation more on a perpendicular surface than on a slanted surface. To compensate for this, we calculate the incident angle of each ray on the virtual object and increase the illumination time in relation to this angle We limit the maximal surface angle to 65° in order to limit the total illumination time.
4- Result
The fabric was changed from one color to another color by using the photochromic dyes . Note that since the texture transfer is done in a black box, no decay due to external light occurs during this process. The (de)activation times could also be significantly decreased by using a stronger projector with more lumen.
We claim
1. Wastage of dyes can be reduced in this invention
2. The fabric colour can be changed many times and design also can be changed according to uv light
3. Photo-chromic dyes mixed into a photochromic solution to create of multi-color textures in cotton fabric