| 摘要 |
Various processes for enhancing the contrast between image and non-image regions of a printed image are implemented by increasing the toner-accepting charge on the surface of a printing form having a ferroelectric layer and from which the image is printed. The increase in charge is achieved, in alternate forms of the inventive process, either by increasing the temperature of the printing form surface relative to the temperature at which the form has been polarized, or by mechanically loading the printing form carrying cylinder for transfer of the toner from the printing form, or by applying additional charge carriers to the entire surface of the printing form (30) so as to create an enhanced potential difference between positively-polarized regions and negatively-polarized regions and, thereby, increased contrast between image and non-image regions.
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