Image forming apparatus, image forming method, and storage medium

An image forming method that is performed by an image forming apparatus comprising a control unit configured to control whether or not to perform thickening processing to thicken an object in an upper layer and an object in a lower layer in image data included in a print job based on a raster operation code designating drawing processing in a case where the object in the upper layer and the object in the lower layer overlap, wherein

• the control unit:
• does not perform the thickening processing in a case where a value of the raster operation code is MERGEPEN and a color of the object in the upper layer is not a black color;
• and
• performs the thickening processing in a case where the value is MERGEPEN, the color of the object in the upper layer is a black color, and a pure black function is applied to the black color.

A non-transitory computer readable storage medium storing a program for causing a computer to perform an image forming method that is performed by an image forming apparatus comprising a control unit configured to control whether or not to perform thickening processing to thicken an object in an upper layer and an object in a lower layer in image data included in a print job based on a raster operation code designating drawing processing in a case where the object in the upper layer and the object in the lower layer overlap, wherein

• the control unit:
• does not perform the thickening processing in a case where a value of the raster operation code is MERGEPEN and a color of the object in the upper layer is not a black color;
• and
• performs the thickening processing in a case where the value is MERGEPEN, the color of the object in the upper layer is a black color, and a pure black function is applied to the black color.