O CUPS usa um banco de dados MIME para determinar quais conversões de arquivo ele pode realizar.
O banco de dados é composto de arquivos *.convs e *.types .
Ambos têm páginas man:
A página man do cupsd lista os locais desses arquivos como:
-
/usr/share/cups/mime/mime.convs -
/usr/share/cups/mime/mime.types
Normalmente há arquivos * .convs e * .types adicionais em /usr/share/cups/mime/ , e o cupsd também usa esses arquivos.
No meu sistema Slackware 14.2, recebo o seguinte:
$ grep -h "^[^#]" /usr/share/cups/mime/*.convs | sort
application/msword text/vnd.cups-brf 30 texttobrf
application/octet-stream application/vnd.cups-raw 0 -
application/pdf application/vnd.cups-pdf 66 pdftopdf
application/pdf text/vnd.cups-brf 100 texttobrf
application/pdf image/tiff 80 pstotiff
application/postscript application/vnd.cups-postscript 66 pstops
application/postscript application/pdf 0 pstopdf
application/postscript image/tiff 80 pstotiff
application/rtf text/vnd.cups-brf 30 texttobrf
application/vnd.adobe-reader-postscript application/vnd.cups-postscript 66 pstops
application/vnd.cups-pdf application/vnd.cups-postscript 100 pdftops
application/vnd.cups-pdf application/vnd.cups-raster 100 pdftoraster
application/vnd.cups-pdf application/vnd.cups-raster 99 gstoraster
application/vnd.cups-pdf image/tiff 80 pstotiff
application/vnd.cups-pdf-banner application/pdf 32 bannertopdf
application/vnd.cups-postscript application/vnd.cups-raster 175 gstoraster
application/vnd.cups-postscript image/tiff 80 pstotiff
application/vnd.cups-raster image/pwg-raster 100 rastertopwg
application/vnd.openxmlformats-officedocument.wordprocessingml.document text/vnd.cups-brf 30 texttobrf
application/x-cshell text/plain 100 -
application/x-cshell application/pdf 32 texttopdf
application/x-csource text/plain 100 -
application/x-csource application/pdf 32 texttopdf
application/x-perl text/plain 100 -
application/x-perl application/pdf 32 texttopdf
application/x-shell text/plain 100 -
application/x-shell application/pdf 32 texttopdf
application/xhtml text/vnd.cups-brf 10 texttobrf
application/xml text/vnd.cups-brf 10 texttobrf
image/gif application/vnd.cups-raster 100 imagetoraster
image/gif application/vnd.cups-pdf 65 imagetopdf
image/gif image/vnd.cups-brf 70 imagetobrf
image/gif image/vnd.cups-ubrl 70 imagetoubrl
image/jpeg application/vnd.cups-raster 100 imagetoraster
image/jpeg application/vnd.cups-pdf 65 imagetopdf
image/jpeg image/vnd.cups-brf 70 imagetobrf
image/jpeg image/vnd.cups-ubrl 70 imagetoubrl
image/pcx image/vnd.cups-brf 70 imagetobrf
image/pcx image/vnd.cups-ubrl 70 imagetoubrl
image/png application/vnd.cups-raster 100 imagetoraster
image/png application/vnd.cups-pdf 65 imagetopdf
image/png image/vnd.cups-brf 70 imagetobrf
image/png image/vnd.cups-ubrl 70 imagetoubrl
image/pwg-raster application/pdf 32 rastertopdf
image/svg image/vnd.cups-brf 70 imagetobrf
image/svg image/vnd.cups-ubrl 70 imagetoubrl
image/tiff application/vnd.cups-raster 100 imagetoraster
image/tiff application/vnd.cups-pdf 65 imagetopdf
image/tiff image/vnd.cups-brf 70 imagetobrf
image/tiff image/vnd.cups-ubrl 70 imagetoubrl
image/urf application/pdf 0 urftopdf
image/vnd.microsoft.icon image/vnd.cups-brf 70 imagetobrf
image/vnd.microsoft.icon image/vnd.cups-ubrl 70 imagetoubrl
image/x-bitmap application/vnd.cups-raster 100 imagetoraster
image/x-bitmap application/vnd.cups-pdf 65 imagetopdf
image/x-ms-bmp image/vnd.cups-brf 70 imagetobrf
image/x-ms-bmp image/vnd.cups-ubrl 70 imagetoubrl
image/x-photocd application/vnd.cups-raster 100 imagetoraster
image/x-photocd application/vnd.cups-pdf 65 imagetopdf
image/x-portable-anymap application/vnd.cups-raster 100 imagetoraster
image/x-portable-anymap application/vnd.cups-pdf 65 imagetopdf
image/x-portable-anymap image/vnd.cups-brf 70 imagetobrf
image/x-portable-anymap image/vnd.cups-ubrl 70 imagetoubrl
image/x-portable-bitmap application/vnd.cups-raster 100 imagetoraster
image/x-portable-bitmap application/vnd.cups-pdf 65 imagetopdf
image/x-portable-bitmap image/vnd.cups-brf 70 imagetobrf
image/x-portable-bitmap image/vnd.cups-ubrl 70 imagetoubrl
image/x-portable-graymap application/vnd.cups-raster 100 imagetoraster
image/x-portable-graymap image/vnd.cups-brf 70 imagetobrf
image/x-portable-graymap image/vnd.cups-ubrl 70 imagetoubrl
image/x-portable-graymap application/vnd.cups-pdf 65 imagetopdf
image/x-portable-pixmap application/vnd.cups-raster 100 imagetoraster
image/x-portable-pixmap application/vnd.cups-pdf 65 imagetopdf
image/x-portable-pixmap image/vnd.cups-brf 70 imagetobrf
image/x-portable-pixmap image/vnd.cups-ubrl 70 imagetoubrl
image/x-sgi-rgb application/vnd.cups-raster 100 imagetoraster
image/x-sgi-rgb application/vnd.cups-pdf 65 imagetopdf
image/x-sun-raster application/vnd.cups-raster 100 imagetoraster
image/x-sun-raster application/vnd.cups-pdf 65 imagetopdf
image/x-xbitmap application/vnd.cups-raster 100 imagetoraster
image/x-xbitmap application/vnd.cups-pdf 65 imagetopdf
image/x-xbitmap image/vnd.cups-brf 70 imagetobrf
image/x-xbitmap image/vnd.cups-ubrl 70 imagetoubrl
image/x-xpixmap application/vnd.cups-raster 100 imagetoraster
image/x-xpixmap application/vnd.cups-pdf 65 imagetopdf
image/x-xpixmap image/vnd.cups-brf 70 imagetobrf
image/x-xpixmap image/vnd.cups-ubrl 70 imagetoubrl
image/x-xwindowdump application/vnd.cups-pdf 65 imagetopdf
image/x-xwindowdump image/vnd.cups-brf 70 imagetobrf
image/x-xwindowdump image/vnd.cups-ubrl 70 imagetoubrl
text/css text/plain 100 -
text/html text/plain 100 -
text/html application/pdf 32 texttopdf
text/html text/vnd.cups-brf 10 texttobrf
text/plain application/pdf 32 texttopdf
text/plain text/vnd.cups-brf 0 texttobrf
text/rtf text/vnd.cups-brf 30 texttobrf
Você também pode ver quais filtros serão usados por uma conversão chamando cupsfilter diretamente com um arquivo e a opção --list-filters (que não imprimirá o arquivo):
$ cupsfilter --list-filters foo.png
imagetoraster
rastertopwg
rastertopdf
(Nota: Eu tenho uma impressora padrão definida via lpoptions , então eu não tenho que fornecer o nome da impressora. Se você precisar, você pode passar o nome da impressora para cupsfilter com o -d opção.)