Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
293 words
A method for the rastered reproduction of colored continuous tone images in single or multi-color printing, in which the image original for the individual printing colors are separately scanned optical-electrically to form respective electrical signals which are quantized in accordance with tone value steps, with the quantized signals controlling one or more recording units by means of which a printing form for the individual printing colors is produced, and in which the surface of the printing form is divided into a network of orthogonal raster sections, the individual raster sections being divided into several orthogonal partial areas, with the signals obtained during the scanning being quantized with such a pulse that each partial area is provided with a quantization pulse, the recording units being so controlled by means of the signals derived during the quantization that within the partial areas of the raster sections one or more coverage spots are recorded on the printing form as printing dots, the surface coverage of which has a size corresponding to the associated tone value, characterized by recording up to a tone value which Corresponds to the size of the smallest printable dot the coverages formed on the partial areas within the sections as a single coherent covering spot, enlarging such covering spot with increasing tone values, dividing the spot into two covering spots when approximately twice the size of the smallest printable dot is reached, similarly enlarging and dividing the covering spots with increasing tone values, and enlarging the covering spots up to a predetermined tone value, and with a further increase in tone value, decreasing the size of the uncovered areas until they are reduced to the smallest printable size, and with further increasing tone value decreasing the number of the uncovered surface areas.
Claim 2
Independent Claim
293 words
A method for the rastered reproduction of colored continuous tone images in single or multi-color printing, in which the image original for the individual printing colors are separately scanned optical-electrically to form respective electrical signals which are quantized in accordance with tone value steps, with the quantized signals controlling one or more recording units by means of which a printing form for the individual printing colors is produced, and in which the surface of the printing form is divided into a network of orthogonal raster sections, the individual raster sections being divided into several orthogonal partial areas, with the signals obtained during the scanning being quantized with such a pulse that each partial area is provided with a quantization pulse, the recording units being so controlled by means of the signals derived during the quantization that within the partial areas of the raster sections one or more coverage spots are recorded on the printing form as printing dots, the surface coverage of which has a size corresponding to the associated tone value, characterized by recording up to a tone value which Corresponds to the size of the smallest printable dot the coverages formed on the partial areas within the sections as a single coherent covering spot, enlarging such covering spot with increasing tone values, dividing the spot into two covering spots when approximately twice the size of the smallest printable dot is reached, similarly enlarging and dividing the covering spots with increasing tone values, and enlarging the covering spots up to a predetermined tone value, and with a further increase in tone value, decreasing the size of the uncovered areas until they are reduced to the smallest printable size, and with further increasing tone value decreasing the number of the uncovered surface areas.
Claim 3
Dependent Claim
27 words
A method according to claim 1, comprising, recording within the raster section, approximately 2 to 10 covering spots for achieving high tone values of over approximately 100.
Claim 4
Dependent Claim
102 words
A method according to claim 1, comprising designating the tone value steps by binary coded numbers so that their individual columns in each case correspond to a predetermined number and arrangement of covering spots within the partial areas of the raster sections, whereby its entire area corresponds to evaluation of the column value of the binary number, and increasing the covering area assigned to one column of the binary number with increase in column number of the binary number by approximately 2, and recording the tone values of the covering areas which correspond columns of the binary number exhibiting the value 1.