Re: [gentoo-user] Scanner and weird streaking
On Fri, Dec 30, 2022 at 1:12 PM Urs Schütz wrote: > > Any chance you need to shield the scanner from light sources outside the scan head? > Throw a dark jacket over it for testing. Or if it's that the light is for some reason too bright and the inside of the lid is reflecting it then try a piece of black construction paper on the underside of the lid. - Mark
[gentoo-user] Scanner and weird streaking
Any chance you need to shield the scanner from light sources outside the scan head? Throw a dark jacket over it for testing.
Re: [gentoo-user] Missing line-drawing characters on re-install
On Fri, Dec 30, 2022 at 06:37:59PM +, Michael wrote > I rarely use xterm and can't recall how it behaves with mutt, so I'm > not sure if the above flags would make any difference. If xterm is > your favourite terminal you may want to give these flags a spin. I've already tried xterm with +/- unicode. No difference. I may have to migrate to urxvt. -- I've seen things, you people wouldn't believe; Gopher, Netscape with frames, the first Browser Wars. Searching for pages with AltaVista, pop-up windows self-replicating, trying to uninstall RealPlayer. All those moments, will be lost in time like tears in rain... time to die.
Re: [gentoo-user] Scanner and weird streaking
On Friday, 30 December 2022 13:42:04 GMT Dale wrote: > Michael wrote: > > On Friday, 30 December 2022 02:28:32 GMT Dale wrote: > >> Howdy all, > >> > >> I have a HP scanjet 4570c flatbed scanner. I bought it used years ago > >> and most of the time, it works just fine. On occasion tho, I get > >> something weird. When I scan something, it adds some pinkish colored > >> streaks. I took a scrap sheet of paper and scanned the back of it. I > >> used a magic marker on some text that was there, also drew a smiley face > >> on it as well. Anyway, the side with print is on the opposite side. > >> Basically, it is also seeing the back side of the paper. I'm not sure > >> if that could cause this weird streaking but wanted to mention it. > > > > I've come across the pink hue artefact on an old HP scanner, but can't > > recall the model. It is not related to the print of the opposite side > > becoming visible, which is caused by a high light exposure setting. You > > need to reduce the exposure to a level where you can see the primary > > print clear enough, without the back side bleeding through. > > I kinda figure that. It is pretty bright. I don't recall seeing a > setting for it but I may not have seen it. I mostly tried different > color settings, resolution and such. Goes to show tho, it is > sensitive. ;-) If the scanner front end doesn't offer an exposure tweak, you could try post- processing of the scanned image using Gimp, or some other image editing software. Reduce exposure until the reverse side print dissipates, while the front remains clear enough. Alternatively, on a simpler set of controls playing with brightness and contrast could get you close enough. > >> At first, I thought it was something on the glass so I disassembled the > >> thing and cleaned it as best as I could. When I put it back together, I > >> concentrated on the back side of the glass, since I have to disassemble > >> it to clean it. I also clean the side the document goes on regularly. > >> If it changed, I can't tell it. Another odd thing, the streaks change > >> depending on the document. Sometimes you can barely see it, other times > >> it is awful. I've not been able to reason out what makes the difference > >> tho. > > > > Cleaning the glass won't affect the pink hue. I dismantled the scanner > > and > > cleaned the glass too, with no improvement. > > > >> I've got about the same results using Scanlite, Scanpage and XSane > >> software. XSane may be a tiny bit better but it does vary at times. > >> There's not a lot of settings available. I tend to use either 100dpi or > >> 300 dpi for resolution thingy. I fiddled around a bit but it doesn't > >> seem to help. This is a link to the page I described above. It's a > >> little sizey so I didn't want to attach, for those who have email > >> clients that puke a lot. lol > >> > >> https://freeimage.host/i/HTQLpWb > >> > >> You may notice that it is a little heavier at the top and gets lighter > >> as it goes down. I've checked the glass, I can't find anything that > >> would cause this. Is my scanner just going bad? Am I doing something > >> wrong with a setting or something? Any ideas? Thoughts? > > > > The pink hue is probably due to the scanner bar going bad. Some fixes, > > which did not work in my case, are as follows: > > > > 1. Reset internal chipset: Plug it in, switch it on, then pull the power > > lead, followed by the USB. Wait for a minute or longer to discharge, then > > reconnect, power on and try to see if the problem is fixed. > > > > 2. Overheating: More of a problem in the summer. Use a desk fan while > > operating to see if it makes a difference. > > > > If none of the above work, then the scanner bar needs replacing. Probably > > time for a new scanner, unless you can find a donor scanner for the > > scanner > > bar. > > Well, bummer. I was afraid it was going bad. I knew it moved the light > thing back and forth and all but know there is a lot more to it than > that. If it was a consistent streak, I'd think a bad CCD or whatever > that chip that grabs the image is called nowadays. This tho, wasn't > looking like that. > > I may disassemble it again and check all the cables. Disconnect and > reconnect everything and hope for a bad or lose connection. Now let us > pray. The pink hue is visible signal noise captured in the image. This may be internal, the scanner sensor is drifting outside its spec, or it could be some external source. Do you always use the scanner in the same position on your desk, or does it give different results depending on location? Strong electromagnetic interference may exacerbate the problem. > Given I only use Linux, know of any good and commonly available flatbed > scanner models? I'm fine with used ones as long as they work. I like > the one I got since when I'm done, it stands upright in my closet and > takes up very little floor space. It does a really good
Re: [gentoo-user] Missing line-drawing characters on re-install
On Friday, 30 December 2022 13:29:30 GMT Walter Dnes wrote: > On Fri, Dec 30, 2022 at 01:05:26PM +, Michael wrote > > > I can't recall what else you have eliminated as the cause of this > > rendering problem. Have you checked: > > > > 1. VT console. > > 2. Different terminal (urxvt, xterm, gnome terminal, konsole, etc.). > > 3. Different DE/Window Manager. > > A bit of digging. For text tty's (tty1, tty2, etc) I use solar24x32 > as the font. On a text tty both mc and mutt work fine (line-drawing) > natively without any hacks. They also work fine on urxvt without any > hacks. Note that the ebuild that provides urxvt is called, wait for it, > > rxvt-unicode > > It looks like urxvt is designed from square 1 to handle unicode, and > xterm is not. OKie dOKie, it is a terminal rendering issue then. I'm not on a PC with mutt right now, so can't confirm, but these are the xterm USE flags I use here: ~ $ equery u x11-terms/xterm [ Legend : U - final flag setting for installation] [: I - package is installed with flag ] [ Colors : set, unset ] * Found these USE flags for x11-terms/xterm-376: U I - - Xaw3d : Add support for the 3d athena widget set + + openpty: Use openpty() in preference to posix_openpt() - - sixel : Enable sixel graphics support - - toolbar: Enable the xterm toolbar to be built + + truetype : Add support for FreeType and/or FreeType2 fonts + + unicode: Add support for Unicode - - verify-sig : Verify upstream signatures on distfiles - - xinerama : Add support for querying multi-monitor screen geometry through the Xinerama API I rarely use xterm and can't recall how it behaves with mutt, so I'm not sure if the above flags would make any difference. If xterm is your favourite terminal you may want to give these flags a spin.
Re: [gentoo-user] Missing line-drawing characters on re-install
On Fri, Dec 30, 2022 at 01:05:26PM +, Michael wrote > I can't recall what else you have eliminated as the cause of this > rendering problem. Have you checked: > > 1. VT console. > 2. Different terminal (urxvt, xterm, gnome terminal, konsole, etc.). > 3. Different DE/Window Manager. A bit of digging. For text tty's (tty1, tty2, etc) I use solar24x32 as the font. On a text tty both mc and mutt work fine (line-drawing) natively without any hacks. They also work fine on urxvt without any hacks. Note that the ebuild that provides urxvt is called, wait for it, rxvt-unicode It looks like urxvt is designed from square 1 to handle unicode, and xterm is not. -- I've seen things, you people wouldn't believe; Gopher, Netscape with frames, the first Browser Wars. Searching for pages with AltaVista, pop-up windows self-replicating, trying to uninstall RealPlayer. All those moments, will be lost in time like tears in rain... time to die.
Re: [gentoo-user] Scanner and weird streaking
On 30/12/2022 13:42, Dale wrote: Given I only use Linux, know of any good and commonly available flatbed scanner models? I'm fine with used ones as long as they work. I like the one I got since when I'm done, it stands upright in my closet and takes up very little floor space. It does a really good job. I've even scanned in pictures and they looked good, when it wasn't doing the streak thing. What do you have by way of a printer? Would you be better with an MFP? Okay, it's not cheap, but I like my HP MFP M477. Cost about £300 for the fdn model. Duplex printer, duplex scanner with document feed, cat-5 (don't think it's wireless). You can probably get similar cheaper ... The thing I really like scanner wise is I just set up a Samba share on my computer, configure the thing, and then I can just scan from the printer front panel and it appears on my computer automagically. Cheers, Wol
Re: [gentoo-user] Scanner and weird streaking
On Fri, Dec 30, 2022 at 6:42 AM Dale wrote: > Well, bummer. I was afraid it was going bad. ;-) If it's still moving then it isn't necessarily bad. Possibly you need a new goal for your old equipment? https://www.youtube.com/watch?v=9Hfj_SuVm_0 Good luck, Mark
Re: [gentoo-user] Scanner and weird streaking
Michael wrote: > On Friday, 30 December 2022 02:28:32 GMT Dale wrote: >> Howdy all, >> >> I have a HP scanjet 4570c flatbed scanner. I bought it used years ago >> and most of the time, it works just fine. On occasion tho, I get >> something weird. When I scan something, it adds some pinkish colored >> streaks. I took a scrap sheet of paper and scanned the back of it. I >> used a magic marker on some text that was there, also drew a smiley face >> on it as well. Anyway, the side with print is on the opposite side. >> Basically, it is also seeing the back side of the paper. I'm not sure >> if that could cause this weird streaking but wanted to mention it. > I've come across the pink hue artefact on an old HP scanner, but can't recall > the model. It is not related to the print of the opposite side becoming > visible, which is caused by a high light exposure setting. You need to > reduce > the exposure to a level where you can see the primary print clear enough, > without the back side bleeding through. > I kinda figure that. It is pretty bright. I don't recall seeing a setting for it but I may not have seen it. I mostly tried different color settings, resolution and such. Goes to show tho, it is sensitive. ;-) >> At first, I thought it was something on the glass so I disassembled the >> thing and cleaned it as best as I could. When I put it back together, I >> concentrated on the back side of the glass, since I have to disassemble >> it to clean it. I also clean the side the document goes on regularly. >> If it changed, I can't tell it. Another odd thing, the streaks change >> depending on the document. Sometimes you can barely see it, other times >> it is awful. I've not been able to reason out what makes the difference >> tho. > Cleaning the glass won't affect the pink hue. I dismantled the scanner and > cleaned the glass too, with no improvement. > > >> I've got about the same results using Scanlite, Scanpage and XSane >> software. XSane may be a tiny bit better but it does vary at times. >> There's not a lot of settings available. I tend to use either 100dpi or >> 300 dpi for resolution thingy. I fiddled around a bit but it doesn't >> seem to help. This is a link to the page I described above. It's a >> little sizey so I didn't want to attach, for those who have email >> clients that puke a lot. lol >> >> https://freeimage.host/i/HTQLpWb >> >> You may notice that it is a little heavier at the top and gets lighter >> as it goes down. I've checked the glass, I can't find anything that >> would cause this. Is my scanner just going bad? Am I doing something >> wrong with a setting or something? Any ideas? Thoughts? > The pink hue is probably due to the scanner bar going bad. Some fixes, which > did not work in my case, are as follows: > > 1. Reset internal chipset: Plug it in, switch it on, then pull the power > lead, followed by the USB. Wait for a minute or longer to discharge, then > reconnect, power on and try to see if the problem is fixed. > > 2. Overheating: More of a problem in the summer. Use a desk fan while > operating to see if it makes a difference. > > If none of the above work, then the scanner bar needs replacing. Probably > time for a new scanner, unless you can find a donor scanner for the scanner > bar. Well, bummer. I was afraid it was going bad. I knew it moved the light thing back and forth and all but know there is a lot more to it than that. If it was a consistent streak, I'd think a bad CCD or whatever that chip that grabs the image is called nowadays. This tho, wasn't looking like that. I may disassemble it again and check all the cables. Disconnect and reconnect everything and hope for a bad or lose connection. Now let us pray. Given I only use Linux, know of any good and commonly available flatbed scanner models? I'm fine with used ones as long as they work. I like the one I got since when I'm done, it stands upright in my closet and takes up very little floor space. It does a really good job. I've even scanned in pictures and they looked good, when it wasn't doing the streak thing. Thanks. Dale :-) :-) signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] Missing line-drawing characters on re-install
On Friday, 30 December 2022 04:08:51 GMT Walter Dnes wrote: > I'm b-a-a-a-a-ck... on my regular desktop. I re-installed with > unicode enabled and locale corrected. Some rough edges, specifically no > line-drawing characters. See attached image. Mutt is supposed to have > horizontal lines from right after the ")" up to the ">". Similarly mc > is supposed to have vertical and horizontal line drawing characters > separating and surrounding the two panels. I can use "mc -a" to get a > decent emulation with "+", "_", and "|" in place of line-drawing > characters. Similarly mutt has the "set ascii_chars" option to get an > ugly version of line-threading. Since this problem shows up on more > than one app, I assume that it's a general system problem. Any ideas on > how to get real line-drawing characters back? I can't recall what else you have eliminated as the cause of this rendering problem. Have you checked: 1. VT console. 2. Different terminal (urxvt, xterm, gnome terminal, konsole, etc.). 3. Different DE/Window Manager. Also may be worth trying Wayland as opposed to Xorg, in case the video card driver likes one more than the other.
Re: [gentoo-user] Scanner and weird streaking
On Friday, 30 December 2022 02:28:32 GMT Dale wrote: > Howdy all, > > I have a HP scanjet 4570c flatbed scanner. I bought it used years ago > and most of the time, it works just fine. On occasion tho, I get > something weird. When I scan something, it adds some pinkish colored > streaks. I took a scrap sheet of paper and scanned the back of it. I > used a magic marker on some text that was there, also drew a smiley face > on it as well. Anyway, the side with print is on the opposite side. > Basically, it is also seeing the back side of the paper. I'm not sure > if that could cause this weird streaking but wanted to mention it. I've come across the pink hue artefact on an old HP scanner, but can't recall the model. It is not related to the print of the opposite side becoming visible, which is caused by a high light exposure setting. You need to reduce the exposure to a level where you can see the primary print clear enough, without the back side bleeding through. > At first, I thought it was something on the glass so I disassembled the > thing and cleaned it as best as I could. When I put it back together, I > concentrated on the back side of the glass, since I have to disassemble > it to clean it. I also clean the side the document goes on regularly. > If it changed, I can't tell it. Another odd thing, the streaks change > depending on the document. Sometimes you can barely see it, other times > it is awful. I've not been able to reason out what makes the difference > tho. Cleaning the glass won't affect the pink hue. I dismantled the scanner and cleaned the glass too, with no improvement. > I've got about the same results using Scanlite, Scanpage and XSane > software. XSane may be a tiny bit better but it does vary at times. > There's not a lot of settings available. I tend to use either 100dpi or > 300 dpi for resolution thingy. I fiddled around a bit but it doesn't > seem to help. This is a link to the page I described above. It's a > little sizey so I didn't want to attach, for those who have email > clients that puke a lot. lol > > https://freeimage.host/i/HTQLpWb > > You may notice that it is a little heavier at the top and gets lighter > as it goes down. I've checked the glass, I can't find anything that > would cause this. Is my scanner just going bad? Am I doing something > wrong with a setting or something? Any ideas? Thoughts? The pink hue is probably due to the scanner bar going bad. Some fixes, which did not work in my case, are as follows: 1. Reset internal chipset: Plug it in, switch it on, then pull the power lead, followed by the USB. Wait for a minute or longer to discharge, then reconnect, power on and try to see if the problem is fixed. 2. Overheating: More of a problem in the summer. Use a desk fan while operating to see if it makes a difference. If none of the above work, then the scanner bar needs replacing. Probably time for a new scanner, unless you can find a donor scanner for the scanner bar. signature.asc Description: This is a digitally signed message part.
[gentoo-user] Missing line-drawing characters on re-install
I'm b-a-a-a-a-ck... on my regular desktop. I re-installed with unicode enabled and locale corrected. Some rough edges, specifically no line-drawing characters. See attached image. Mutt is supposed to have horizontal lines from right after the ")" up to the ">". Similarly mc is supposed to have vertical and horizontal line drawing characters separating and surrounding the two panels. I can use "mc -a" to get a decent emulation with "+", "_", and "|" in place of line-drawing characters. Similarly mutt has the "set ascii_chars" option to get an ugly version of line-threading. Since this problem shows up on more than one app, I assume that it's a general system problem. Any ideas on how to get real line-drawing characters back? -- I've seen things, you people wouldn't believe; Gopher, Netscape with frames, the first Browser Wars. Searching for pages with AltaVista, pop-up windows self-replicating, trying to uninstall RealPlayer. All those moments, will be lost in time like tears in rain... time to die.
