Nowadays growth in graphic industry based on demands of modern marketing, request higher speed and quality of production. Inkjet printing fulfill those requirements, and its biggest adventage is print on demand (because of printing head construction), printing on different materials and fast job switches. Printing speed can be achieved with implementation of large width Inkjet machines. Unfortunately, printed reproduction on this machines will not be so high in quality as reproduction on machines that can print only on small or middle sized formats. Therefore, printing with additional light cyan and light magenta, can result with better continuous transition in lighter parts of color printed images. This paper will analyze how high speed Inkjet machine Durst Rho500 works in two modes (CMYK and CMYKlclm) due printing speed 170 m2/h. Used material will be textile with impregnated black backsurface 285 g/m2. Diferences in printed color will be defined with measurement of 378 color fields which defines reproduction gamut. Beside diferences in gamut volume, it will be defined what is the amount of color deviation between CMYK and CMYKlclm reproduction with construction densitometer curves of reproduction. At the same time it will be compared achieved increase of cyan and magenta separation. Device used for measuring densitometer values will be X-Rite eXact. For more detailed analysis of printed photos it will be defined deviation range of fine raster elements (in range from 5 to 20% RTV), and that will be accomplished with device for image analysis (Personal IAS). For reproduction of text, it is important to control thichness of most thin lines. In so doing, it is determinate deviation of lines with thichness 160 µm and 750 µm. With same device for image analysis will be defined line profile, thickness, blurness and roughness of cyan and magenta lines. With that results will be specified cost effectiveness of four color and six color printing on large width materials. Printing with six colors on printing machine Durst Rho 500 will not achieve major color difereces in regarding to CMYK color printing.