A synthesized image is formed by synthesizing a main image and a background mage represented by respective image data items each having n-valued gradation values each having any one of n possible values(n is an integer which is equal to or larger than 3) and defining a density of pixels. A plurality
A synthesized image is formed by synthesizing a main image and a background mage represented by respective image data items each having n-valued gradation values each having any one of n possible values(n is an integer which is equal to or larger than 3) and defining a density of pixels. A plurality of different data items representative of candidates for the background image are stored as background image data candidates. An arbitrary one of the background image data candidates is set to a background image data item representative of the background image. There is formed a main image data item forming a main image data item representative of the main image, the main image data item having n-valued main image gradation values commonly applied to all valid pixels of the main image, as values of the n-value gradation values. An adjusted background image data item is formed by forming an adjusted background image data item by modifying the background image data item through replacing background gradation values applied to pixels of the background image as values of the n-valued gradation values by adjusted background gradation values formed by modifying the background gradation values. A synthesized image data item representative of the synthesized image is formed by synthesizing the main image and the background image based on the adjusted background image data item and the main image data item.
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1. An image forming method of forming a synthesized image by synthesizing a main image and a background image represented by respective image data items each having n-valued gradation values each having any one of n possible values (n is an integer which is equal to or larger than 3) and defining a
1. An image forming method of forming a synthesized image by synthesizing a main image and a background image represented by respective image data items each having n-valued gradation values each having any one of n possible values (n is an integer which is equal to or larger than 3) and defining a density of pixels,the image forming method comprising the steps of:storing a plurality of different data items representative of candidates for said background image, as background image data candidates;setting an arbitrary one of said background image data candidates to a background image data item representative of said background image;forming a main image data item representative of said main image, said main image data item having n-valued main image gradation values commonly applied to all valid pixels of said main image, as values of said n-valued gradation values;forming an adjusted background image data item by modifying said background image data item through replacing background gradation values applied to pixels of said background image as values of said n-valued gradation values by adjusted background gradation values formed by modifying said background gradation values; andforming a synthesized image data item representative of said synthesized image by synthesizing said main image and said background image based on said adjusted background image data item and said main image data item;wherein the step of forming said main image data item comprises the steps of;inputting text data as a source of said main image; andconverting said text data into image data based on predetermined font data to thereby form a main shape image data item representative of a main shape image forming a shape of said main image, by assigning a validity-indicative value of predetermined two values to all pixels of said main shape image as said all valid pixels of said main image, and assigning an invalidity-indicative value of said predetermined two values to the remaining pixels of said main image. 2. An image forming method according to claim 1, wherein the adjustment of said background gradation values is carried out such that said density of said pixels of said background image is decreased. 3. An image forming method according to claim 1, wherein the adjustment of said background gradation values is carried out by uniformly multiplying each of said background gradation values corresponding to each pixel by a predetermined factor. 4. An image forming method according to claim 1, wherein said background image data candidates include arbitrary data items each representative of an arbitrary dot image formed by inputting data of dots as desired. 5. An image forming method according to claim 1, wherein said predetermined font data is outline font data. 6. An image forming method according to claim 1, further including the step of arbitrarily setting said n-valued main image gradation values. 7. An image forming method according to claim 1,wherein said main image is a color image,wherein said main image gradation values include primary color gradation values of three primary colors, andwherein setting of said main image gradation values is setting of a color of said main image. 8. An image forming method according to claim 7, wherein said plurality of basic colors include three primary colors, said three primary colors being cyan, magenta, and yellow. 9. An image forming method according to claim 7, wherein said plurality of basic colors include a basic color corresponding to a mixed color of said three primary colors. 10. An image forming method according to claim 7, wherein said plurality of basic colors include three primary colors, said three primary colors being red, green, and blue. 11. An image forming method according to claim 1, wherein said synthesized image is formed as a print image to be printed on a printing object. 12. An image forming method according to claim 11, wherein said printing object is a tape. 13. An image forming metho d according to claim 11, wherein said print image is printed by an ink jet printing method. 14. An image forming method according to claim 1, wherein said synthesized image is formed as a display image to be displayed on a display screen. 15. An image forming method according to claim 1, further including the step of determining whether or not the adjustment of said background gradation values should be executed; andwherein the step of forming said synthesized image includes forming said synthesized image data item based on said adjusted background image data when it is determined that the adjustment of said background gradation values should be executed. 16. An image forming method according to claim 1, further including the step of carrying out dithering based on a dither matrix in which m-valued thresholds (m is an integer which is equal to or larger than 2) each defined by any one of m possible numerical values are arranged as matrix elements for comparison with said n-valued gradation values. 17. An image forming method according to claim 1,wherein said main image is a color image,wherein said main image gradation values include a plurality of basic color gradation values as gradation values of a plurality of basic colors defining a color of said color image,wherein said plurality of basic colors include three primary colors, andwherein the adjustment of said background gradation values is carried out on each of said plurality of basic color gradation values. 18. An image forming method according to claim 17, wherein the adjustment of said background gradation value is uniformly carried out on said plurality of basic gradation values. 19. An image forming device for forming a synthesized image by synthesizing a main image and a background image represented by respective image data items each having n-valued gradation values each having any one of n possible values (n is an integer which is equal to or larger than 3) and defining a density of pixels,the image forming device comprising:background image data candidate storage means for storing a plurality of different data items representative of candidates for said background image as background image data candidates;background image data-setting means for setting an arbitrary one of said background image data candidates to a background image data item representative of said background image;main image data-forming means for forming a main image data item representative of said main image, said main image data item having n-valued main image gradation values commonly applied to all valid pixels of said main image, as values of said n-valued gradation values;adjusted background image data-forming means for forming an adjusted background image data item by modifying said background image data item through replacing background gradation values applied to pixels of said background image as values of said n-valued gradation values by adjusted background gradation values formed by modifying said background gradation values; andsynthesized image data-forming means for forming a synthesized image data item representative of said synthesized image by synthesizing said main image and said background image based on said adjusted background image data and said main image data item;wherein said main image data-forming means comprises:text data-inputting means for inputting text data as a source of said main image; andmain shape image data-forming means for converting said text data into image data based on predetermined font data to thereby form a main shape image data item representative of a main shape image forming a shape of said main image, by assigning a validity-indicative value of predetermined two values to all pixels of said main shape image as said all valid pixels of said main image, and assigning an invalidity-indicative value of said predetermined two values to the remaining pixels of said main image. 20. An image forming device according to claim 19, wherein the adjustmen t of said background gradation values is carried out such that said density of said pixels of said background image is decreased. 21. An image forming device according to claim 19, wherein the adjustment of said background gradation values is carried out by uniformly multiplying each of said background gradation values corresponding to each pixel by a predetermined factor. 22. An image forming device according to claim 19, wherein said background image data candidates include arbitrary data items each representative of an arbitrary dot image formed by inputting data of dots as desired. 23. An image forming device according to claim 19, wherein said predetermined font data is outline font data. 24. An image forming device according to claim 19, further including main image gradation value-setting means for arbitrarily setting said n-valued main image gradation values. 25. An image forming device according to claim 19,wherein said main image is a color image,wherein said main image gradation values include primary color gradation values of three primary colors, andwherein setting of said main image gradation values is setting of a color of said main image. 26. An image forming device according to claim 25, wherein said plurality of basic colors include three primary colors, said three primary colors being cyan, magenta, and yellow. 27. An image forming device according to claim 25, wherein said plurality of basic colors include a basic color corresponding to a mixed color of said three primary colors. 28. An image forming device according to claim 25, wherein said plurality of basic colors include three primary colors, said three primary colors being red, green, and blue. 29. An image forming device according to claim 19,wherein said main image is a color image,wherein said main image gradation values include a plurality of basic color gradation values as gradation values of a plurality of basic colors defining a color of said color image,wherein said plurality of basic colors include three primary colors, andwherein the adjustment of said background gradation values is carried out on each of said plurality of basic color gradation values. 30. An image forming device according to claim 29, wherein the adjustment of said background gradation value is uniformly carried out on said plurality of basic gradation values. 31. An image forming device according to claim 19, wherein said synthesized image is formed as a print image to be printed on a printing object. 32. An image forming device according to claim 31, wherein said printing object is a tape. 33. An image forming device according to claim 31, wherein said print image is printed by an ink jet printing method. 34. An image forming device according to claim 19, wherein said synthesized image is formed as a display image to be displayed on a display screen. 35. An image forming device according to claim 19, further including background gradation value adjustment-determining means for determining whether or not the adjustment of said background gradation values should be executed; andwherein said synthesized image data-forming means forms said synthesized image data items based on said adjusted background image data when it is determined that the adjustment of said background gradation values should be executed. 36. An image forming device according to claim 19, further including dithering means for carrying out dithering based on a dither matrix in which m-valued thresholds (m is an integer which is equal to or larger than 2) each defined by any one of m possible numerical values are arranged as matrix elements for comparison with said n-valued gradation values.
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