Deskew and auto combine

[ylafont]

I have 2 novice questions on IM and hoping someone can provide some tutelage,

I am have been trying to deskew an image but recieve warnings. I was was wondering if i was doing something wrong

convert image1.tiff -deskew 40% image1_Deskewed reports

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convert.im6: "XPosition": Information lost writing value (-0.00333333) as (unsigned) RATIONAL. `/home/pi/PiScans/Scan-15395/bw_NoBo                                           rder_Deskewedout2.tif' @ warning/tiff.c/TIFFWarnings/768.
convert.im6: "YPosition": Information lost writing value (-0.106667) as (unsigned) RATIONAL. `/home/pi/PiScans/Scan-15395/bw_NoBord                                           er_Deskewedout2.tif' @ warning/tiff.c/TIFFWarnings/768.

and
convert image1.tiff -set option:deskew:auto-crop image1_Deskewed reports the same

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convert.im6: "XPosition": Information lost writing value (-0.00333333) as (unsigned) RATIONAL. `/home/pi/PiScans/Scan-15395/bw_NoBorder_Deskewedout2.tif' @ warning/tiff.c/TIFFWarnings/768.
convert.im6: "YPosition": Information lost writing value (-0.106667) as (unsigned) RATIONAL. `/home/pi/PiScans/Scan-15395/bw_NoBorder_Deskewedout2.tif' @ warning/tiff.c/TIFFWarnings/768

.


is there something else i need to try or can these warning be safely ignored?

additionally. the scripted that execute this command acutually runs a few command at the same time.

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		convert $tmpdir/$page -colorspace gray -level 10%,90%,1 -blur 2 +dither -monochrome $tmpdir/bw_$page
		convert $tmpdir/bw_$page -stroke black -fill black -draw "rectangle 0,0 50,3505" -draw "rectangle 0,0 2548,50" -draw "rectangle 0,3405 2548,3505" -draw "rectangle 2448,0 2548,3505" +matte $tmpdir/bw_Border_$page
		convert $tmpdir/bw_Border_$page -fill white -draw "color 0,0 floodfill" +matte $tmpdir/bw_NoBorder_$page
		#tifftopnm --quiet raw_page_bw_noborder.tiff | pamtilt -
		#convert $tmpdir/bw_NoBorder_$page -deskew 40% $tmpdir/bw_NoBorder_Deskewed$page
		convert $tmpdir/bw_NoBorder_$page -set option:deskew:auto-crop $tmpdir/bw_NoBorder_Deskewed$page

Is there a method of concatenating these command into one to shorten processing time?

thank you.

[snibgo]

I know nothing about "Information lost writing value".

Your commands are mostly of the form:

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convert file_1 {processing_1} file_2
convert file_2 {processing_2} file_3
convert file_3 {processing_3} file_4

If you don't need file_2 and file_3 you can do this:

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convert file_1 {processing_1} {processing_2} {processing_3} file_4

If you do need file_2 and file_3 you can:

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convert file_1 {processing_1} +write file_2 {processing_2} +write file_3 {processing_3} file_4

However, beware of one {processing} group that sets something (eg "-fill", "-compose") where another {processing} group assumes a default value for that setting.

[ylafont]

snibgo, you are correct on the format. I don not need the generated files with the exception of the last one.

Thank you for the guidance. Will try out as soon as i get a new machine up and running. thank you.