A method for obtaining an image file including an alpha channel, the method comprising the steps: - placing an object on a surface of a transparent platform with a round, oval, elliptic or otherwise curved cross section; - illuminating a background of the object placed on the platform in a first color by a display, which preferably contains a plurality of LEDs and which has display parts (30a,c) arranged beneath and behind the platform, connected by an angled or curved display part to achieve a continuous background illumination; - taking a first image of the object placed on the platform with a photographic camera; - illuminating a background of the object placed on the platform in a second color that is different from the first color by the display,; - taking a second image of the object placed on the platform with the photographic camera; - creating transparency values between a first transparency value for a transparent pixel and a second transparency value for a non-transparent pixel from said first and second images (201, 202); - wherein a pixel has the first transparency value, when a difference between an RGB value of a pixel in said first image and an RGB value of a corresponding pixel in said second image matches a maximum difference between RGB values of the pixels in said first image and the corresponding pixels in said second image; - wherein a pixel has the second transparency value, when a difference between an RGB value of a pixel in said first image and an RGB value of a corresponding pixel in said second image is smaller than a maximum difference between the pixels in said first image and the corresponding pixels in said second image and is zero or in a certain, predefined range; - taking a separate image with the photographic camera of the object placed on the platform different from said first and the second image (201, 202) and in which the lighting of the object is optimized for obtaining a realistic and/or advantageous image of the object; and - creating an image file including an alpha channel based on said separate image and the transparency values obtained from said first and second images (201, 202), characterized in that the edge of the platform facing the display for background illumination has a chamfer or bevel to reduce reflections. - placing an object on a surface of a transparent platform with a round, oval, elliptic or otherwise curved cross section; - illuminating a background of the object placed on the platform in a first color by a display, which preferably contains a plurality of LEDs and which has display parts (30a,c) arranged beneath and behind the platform, connected by an angled or curved display part to achieve a continuous background illumination; - taking a first image of the object placed on the platform with a photographic camera; - illuminating a background of the object placed on the platform in a second color that is different from the first color by the display,; - taking a second image of the object placed on the platform with the photographic camera; - creating transparency values between a first transparency value for a transparent pixel and a second transparency value for a non-transparent pixel from said first and second images (201, 202); - wherein a pixel has the first transparency value, when a difference between an RGB value of a pixel in said first image and an RGB value of a corresponding pixel in said second image matches a maximum difference between RGB values of the pixels in said first image and the corresponding pixels in said second image; - wherein a pixel has the second transparency value, when a difference between an RGB value of a pixel in said first image and an RGB value of a corresponding pixel in said second image is smaller than a maximum difference between the pixels in said first image and the corresponding pixels in said second image and is zero or in a certain, predefined range; - taking a separate image with the photographic camera of the object placed on the platform different from said first and the second image (201, 202) and in which the lighting of the object is optimized for obtaining a realistic and/or advantageous image of the object; and - creating an image file including an alpha channel based on said separate image and the transparency values obtained from said first and second images (201, 202),