Process for manufacturing an optically variable security device, said security device comprising a carrier, said process comprising the following steps: - printing an array forming a first part of the carrier, said array comprising a plurality of pixels, each pixel comprising at least two sub-pixels (123, 124, 125) of different colours, - opacification of at least one region of a second part of the carrier by means of a laser, said second part being separated from the first part by a transparent optical separator, said at least one opacified region being positioned facing at least one sub-part of at least a first sub-pixel (123, 124, 125) of a pixel associated with said opacified region, said pixel being positioned in a first zone of the array, so that said opacified region masks at least in part: - the first sub-pixel (123, 124, 125) of said pixel when the security device is viewed in a first direction, and - a second sub-pixel (123, 124, 125) of said pixel when the security device is viewed in a second direction, the process further comprising modification of a third part of the carrier through application of the laser, facing at least one part of at least one sub-pixel (123, 124, 125) of at least one pixel positioned in a second zone of the array, said modification making it possible to obtain the final colour of said at least one pixel, the third part of the carrier thus modified and the second zone of the array forming a graphical representation, characterized in that: - the first part of the carrier is positioned between the second part of the carrier and the third part of the carrier, - the opacification of the second part of the carrier and the modification of the third part of the carrier are carried out using the same laser, - during the opacification, the second part of the carrier is positioned between the laser and the first part of the carrier, and - during the modification, the third part of the carrier is positioned between the laser and the first part of the carrier. - printing an array forming a first part of the carrier, said array comprising a plurality of pixels, each pixel comprising at least two sub-pixels (123, 124, 125) of different colours, - opacification of at least one region of a second part of the carrier by means of a laser, said second part being separated from the first part by a transparent optical separator, said at least one opacified region being positioned facing at least one sub-part of at least a first sub-pixel (123, 124, 125) of a pixel associated with said opacified region, said pixel being positioned in a first zone of the array, so that said opacified region masks at least in part: - the first sub-pixel (123, 124, 125) of said pixel when the security device is viewed in a first direction, and - a second sub-pixel (123, 124, 125) of said pixel when the security device is viewed in a second direction, the process further comprising modification of a third part of the carrier through application of the laser, facing at least one part of at least one sub-pixel (123, 124, 125) of at least one pixel positioned in a second zone of the array, said modification making it possible to obtain the final colour of said at least one pixel, the third part of the carrier thus modified and the second zone of the array forming a graphical representation, - the first sub-pixel (123, 124, 125) of said pixel when the security device is viewed in a first direction, and - a second sub-pixel (123, 124, 125) of said pixel when the security device is viewed in a second direction, the process further comprising modification of a third part of the carrier through application of the laser, facing at least one part of at least one sub-pixel (123, 124, 125) of at least one pixel positioned in a second zone of the array, said modification making it possible to obtain the final colour of said at least one pixel, the third part of the carrier thus modified and the second zone of the array forming a graphical representation, - the first part of the carrier is positioned between the second part of the carrier and the third part of the carrier, - the opacification of the second part of the carrier and the modification of the third part of the carrier are carried out using the same laser, - during the opacification, the second part of the carrier is positioned between the laser and the first part of the carrier, and - during the modification, the third part of the carrier is positioned between the laser and the first part of the carrier.