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@ -27,16 +27,16 @@ software, because the raw pixel data never has to be loaded into memory.
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The following table shows how img2pdf handles different input depending on the
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The following table shows how img2pdf handles different input depending on the
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input file format and image color space.
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input file format and image color space.
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| Format | Colorspace | Result |
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| Format | Colorspace | Result |
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| ------------------------------------- | ------------------------------ | ------------- |
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| ------------------------------------- | ------------------------------------ | ------------- |
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| JPEG | any | direct |
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| JPEG | any | direct |
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| JPEG2000 | any | direct |
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| JPEG2000 | any | direct |
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| PNG (non-interlaced, no transparency) | any | direct |
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| PNG (non-interlaced, no transparency) | any | direct |
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| TIFF (CCITT Group 4) | monochrome | direct |
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| TIFF (CCITT Group 4) | 1-bit monochrome | direct |
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| JBIG2 (single-page generic coding) | bi-level | direct |
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| JBIG2 (single-page generic coding) | 1-bit monochrome | direct |
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| any | any except CMYK and monochrome | PNG Paeth |
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| any | any except CMYK and 1-bit monochrome | PNG Paeth |
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| any | monochrome | CCITT Group 4 |
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| any | 1-bit monochrome | CCITT Group 4 |
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| any | CMYK | flate |
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| any | CMYK | flate |
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For JPEG, JPEG2000, non-interlaced PNG, TIFF images with CCITT Group 4
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For JPEG, JPEG2000, non-interlaced PNG, TIFF images with CCITT Group 4
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encoded data, and JBIG2 with single-page generic coding (e.g. using `jbig2enc`),
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encoded data, and JBIG2 with single-page generic coding (e.g. using `jbig2enc`),
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@ -49,7 +49,7 @@ solutions for these input formats.
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For all other input types, img2pdf first has to transform the pixel data to
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For all other input types, img2pdf first has to transform the pixel data to
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make it compatible with PDF. In most cases, the PNG Paeth filter is applied to
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make it compatible with PDF. In most cases, the PNG Paeth filter is applied to
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the pixel data. For monochrome input, CCITT Group 4 is used instead. Only for
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the pixel data. For 1-bit monochrome input, CCITT Group 4 is used instead. Only for
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CMYK input no filter is applied before finally applying flate compression.
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CMYK input no filter is applied before finally applying flate compression.
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Usage
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Usage
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