Thank you Allan. TL;DR: It was indeed a problem with the Brother backend, and even more so with Brother's outdated downloads on its website.
On 15-06-27 06:35 PM, m. allan noah wrote: > t/l/x/y are weird in scanimage, they are basically renamed options > from the backend, and the '=' sign rules are different than other > options. Thanks for explaining the idiosyncrasy to me. My view is that of a naive user that longs for a consistent and efficient user interface without knowing anything about the history. Attached is a patch to the scanimage man page that would have saved my time and hopefully will save other users' time. > if you don't specify an arg to -B, it defaults to 1 meg. If that does > not solve your issue, then it sounds like a bug in the brother > backend. You might try using another frontend to verify. Indeed the problem was in the Brother backend, brscan3, distributed from Brother's website. On my machine was brscan3 version 0.2.11-5, dated June 5, 2012, still linked today from the support page [1]. When searching for the backend today, I landed on [2] where I found a newer version of the backend, 0.2.13-1, dated April 14, 2015. I installed the newer version of the backend. It deleted the configuration files for the previous version (not very elegant), but it fixed the bug. No -B necessary. Yuv [1] <http://support.brother.com/g/s/id/linux/en/download_scn.html> [2] <http://support.brother.com/g/b/downloadlist.aspx?c=ca&lang=en&prod=mfc6490cw_all&os=128>
diff --git a/doc/scanimage.man b/doc/scanimage.man index 79a1251..f726713 100644 --- a/doc/scanimage.man +++ b/doc/scanimage.man @@ -262,9 +262,9 @@ level. .PP The .B \-B -or -.B \-\-buffer-size -changes the input buffer size from 32KB to the number kB specified or 1M. +option without argument changes the input buffer size from the default 32KB to 1MB. For finer grained control, use +.B \-\-buffer-size= +followed by the number of KB. .PP The .B \-V
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