A projector color correcting method comprising: a color conversion generation step (S1-S5; S21-S26) for generating a color conversion to match each color of each of pixels or blocks of an image projected onto a projection plane, wherein said projection plane is not uniform in color, based on previously set first color information (XW1, YW1, ZW1) on the color of pixels of an image (5c; 5w) projected onto the projection plane, and based on second color information (XW2, YW2, ZW2) of pixels of the image acquired from the projection plane as a result of capturing the image (5c; 5w) projected onto the projection plane; wherein said color conversion generation step constructs a color conversion which matches the appearance of color in said first color information of the projected image with the color of said second color information of the image projected onto the projection plane by using chromatic adaptation models or color appearance models, and wherein said color conversion generation step comprises: an association step for protecting (S1- S21) a pattern image onto the projection plane, and capturing the pattern image to acquire a captured pattern image for establishing an association (S2; S22) of pixels or blocks or feature points of the pattern image with pixels or blocks or feature points of the captured pattern image; a color information acquisition step (S3; S23) for projecting a color image onto the projection plane, capturing the color image to acquire a captured color image, and acquiring the second color information as color information for each pixel or block or each of feature points of the captured color image; and a color conversion calculation step (S4-S5; S24-S26) for calculating a color conversion for each pixel or block of the color image based on the first color information, the second color information, and said association; and a color correction step (S6; S27) for correcting an input image (D i) for colors on a pixel-by-pixel or block-by-block basis using the color conversion. a color conversion generation step (S1-S5; S21-S26) for generating a color conversion to match each color of each of pixels or blocks of an image projected onto a projection plane, wherein said projection plane is not uniform in color, based on previously set first color information (XW1, YW1, ZW1) on the color of pixels of an image (5c; 5w) projected onto the projection plane, and based on second color information (XW2, YW2, ZW2) of pixels of the image acquired from the projection plane as a result of capturing the image (5c; 5w) projected onto the projection plane; wherein said color conversion generation step constructs a color conversion which matches the appearance of color in said first color information of the projected image with the color of said second color information of the image projected onto the projection plane by using chromatic adaptation models or color appearance models, and wherein said color conversion generation step comprises: an association step for protecting (S1- S21) a pattern image onto the projection plane, and capturing the pattern image to acquire a captured pattern image for establishing an association (S2; S22) of pixels or blocks or feature points of the pattern image with pixels or blocks or feature points of the captured pattern image; a color information acquisition step (S3; S23) for projecting a color image onto the projection plane, capturing the color image to acquire a captured color image, and acquiring the second color information as color information for each pixel or block or each of feature points of the captured color image; and a color conversion calculation step (S4-S5; S24-S26) for calculating a color conversion for each pixel or block of the color image based on the first color information, the second color information, and said association; and an association step for protecting (S1- S21) a pattern image onto the projection plane, and capturing the pattern image to acquire a captured pattern image for establishing an association (S2; S22) of pixels or blocks or feature points of the pattern image with pixels or blocks or feature points of the captured pattern image; a color information acquisition step (S3; S23) for projecting a color image onto the projection plane, capturing the color image to acquire a captured color image, and acquiring the second color information as color information for each pixel or block or each of feature points of the captured color image; and a color conversion calculation step (S4-S5; S24-S26) for calculating a color conversion for each pixel or block of the color image based on the first color information, the second color information, and said association; and a color correction step (S6; S27) for correcting an input image (D i) for colors on a pixel-by-pixel or block-by-block basis using the color conversion.