Image forming apparatus capable of changing thickness of character, control method therefor, and storage medium storing control program therefor

A control method for an image processing apparatus, the control method comprising:

• generate a graphic object from a drawing command set for printing the graphic object included in a print job;
• generate a first mask image by rendering the graphic object;
• generate a second mask image by shifting the first mask image in a thickening direction by the number of pixels of a thickening width;
• generate a third mask image by logically composing the first mask image and the second mask image;
• convert the third mask image into intermediate data;
• and
• generate a raster image by rendering of the intermediate data.

A non-transitory computer-readable storage medium storing a control program causing a computer to execute a control method for an image forming apparatus, the control method comprising:

• generate a graphic object from a drawing command set for printing the graphic object included in a print job;
• generate a first mask image by rendering the graphic object;
• generate a second mask image by shifting the first mask image in a thickening direction by the number of pixels of a thickening width;
• generate a third mask image by logically composing the first mask image and the second mask image;
• convert the third mask image into intermediate data;
• and
• generate a raster image by rendering of the intermediate data.