METHOD AND APPARATUS FOR CONVERTING IMAGE REPRESENTATION FORMATS AS WELLAS AN IMAGE REPRODUCTION SYSTEM PROVIDED WITH SUCH AN APPARATUS

摘要

The invention is related to a method for converting a series of drawinginstructions suitable for assigning pixel values corresponding to said drawinginstructions to pixels positioned in an image arranged in rows and columnsof pixels, to a series of runlengths and corresponding pixel values. Arunlength hereby represents the number of successive pixels with mutualidentical pixel values while the series of runlengths and pixel values isarranged according to a first order as determined by successive pixelpositions. First the runlengths of the pixel values as generated by the drawinginstructions are determined in a second order which is different from the firstorder. Consequently, the insert positions of said determined runlengths aredetermined on the basis of pixel positions which are corresponding with saiddetermined runlengths. On the basis of these insert positions, saiddetermined runlengths are inserted in the series of runlengths according to anprescription for inserting whereby runlengths in the series which havepositions in common with said runlengths to be inserted, are modified independance on the said runlengths and pixel values to be inserted.