Re: [gentoo-user] CMYK comparison to sRGB between platforms
On Wednesday 09 September 2015 14:41:19 Mick wrote: > Would you mind explaining how it works? You measure the icc of a monitor - > what do you do with this then? Do you need to be running something like > colord all the time to feed some correction data to xranrd? You get a live DVD (Fedora) with the calibration program and some user notes. The device comes with a strap to hold it against the middle of the screen, and a 6' USB lead. The measuring process is straightforward, though complicated for me by the fact that my screen is LED, not LCD. Still, I told it to treat it as an LCD and the result, though a bit bright for my eyes, appears accurate enough. It also knows about CRTs and projectors. Once the calibration is complete (about 10 minutes for the standard calibration) you have to copy the .icc directory from ~/.local/share to a USB stick or something, then reboot into your usual system and double-click on the file in your GUI file manager. That transfers the data to the monitor, apparently permanently. Simple, once you get out of the habit of using the CLI. Well, it would be, except that I had to run: $ Find / -iname \*.icc 2> /dev/null $ mv .local/share/icc . Then I could see the icc folder in the file manager and drag it to the USB stick. As for double monitors, the calibration program on the DVD asks you to choose the monitor to calibrate, so it can detect more than one at a time, but I don't know how transferring the .icc in the main system would work with two monitors. You might have to download and install the client tools. HTH. -- Rgds Peter
[gentoo-user] Re: new computer : any advice ?
Fernando Rodriguez outlook.com> writes: > > albeit in it's infancy. Naturally it's going to take a while to > > become mainstream useful; but that more like a year or 2, at most. > > The value I see on that technology for desktop computing is that we get the > GPUs for what they're made (graphics processing) but their resources go unused > by most applications, not in buying powerful GPUs for the purpose of offloading > general purpose code, if that's the goal you're better off investing in more > general purpose cores that are more suited for the task. I think most folks when purchasing a workstation include a graphics card on the list of items to include. So my suggestions where geared towards informing folks about some of the new features of gcc that may intice them to consider the graphics card resources in an expanded vision of general resources for their workstation. > To trully take advantage of the GPU the actual algorithms need to be rewritten > to use features like SIMD and other advanced parallelization features, most > desktop workloads don't lend themselves for that kind of parallelization. Not true if what openacc hopes to achived indeed does become a reality. Currently, you are most correct. Things change; I'm an optimist because I see what is occuring in embedded devices, arm64, and cluster codes. ymmv. > That > is why despite similar predictions about how OpenMP-like parallel models would > obsolete the current threads model since they where first proposed, it hasn't > happened yet. Yes it's still new technology, controversial, just like systemd, clusters, and Software Defined Networks. > Even for the purpose of offloading general purpose code, it seems with all the > limitations on OpanACC kernels few desktop applications can take advantage of > it (and noticeably benefit from it) without major rewrites. Off the top of my > head audio, video/graphics encoders, and a few other things that max out the > cpu and can be broken into independent execution units. You are taking a very conservative view of things. Codes being worked out now for clusters, will find their way to expand the use of the video card resources, for general purpose things. Most of this will occur as compiler enhancements, not rewriting by hand or modifying algorithmic designs of existing codes. Granted they are going to mostly apply to multi-threaded application codes. When folks buy new hardware, it is often a good time to look at what is on the horizon for computers they use. All I have pointed out is a very active area that benefits folks to review for themselves. I not pushing expenditures of any kind on any hardware. Caveat Emptor. James
Re: [gentoo-user] Re: new computer : any advice ?
On Thu, Sep 10, 2015 at 8:20 AM, james wrote: > I think most folks when purchasing a workstation include a graphics > card on the list of items to include. So my suggestions where geared > towards informing folks about some of the new features of gcc that > may intice them to consider the graphics card resources in an > expanded vision of general resources for their workstation. Sure, but keep in mind depreciation. If all you need today is a $30 graphics card, then you probably should just spend $30. If you think that software will be able to use all kinds of fancy features on a $300 graphics card in two years, you should just spend $30 today, and then wait two years and buy the fancy graphics card on clearance for $10. It is pretty rare that it is a wise move to spend money today on computer hardware that you don't have immediate plans to use. The only time it might make sense is if some kind of QA process means that you're going to spend a lot more money on re-qualifying your system after the upgrade than it would cost to just do it once and overspend on hardware. However, in general I'm not a big fan of those kinds of QA practices in the first place. -- Rich
Re: [gentoo-user] Re: new computer : any advice ?
On Thu, 10 Sep 2015 12:20:39 + (UTC) james wrote: > Fernando Rodriguez outlook.com> writes: > > > > albeit in it's infancy. Naturally it's going to take a while to > > > become mainstream useful; but that more like a year or 2, at most. > > > > The value I see on that technology for desktop computing is that we > > get the GPUs for what they're made (graphics processing) but their > > resources go unused by most applications, not in buying powerful > > GPUs for the purpose of offloading general purpose code, if that's > > the goal you're better off investing in more general purpose cores > > that are more suited for the task. It is true. > I think most folks when purchasing a workstation include a graphics > card on the list of items to include. So my suggestions where geared > towards informing folks about some of the new features of gcc that > may intice them to consider the graphics card resources in an > expanded vision of general resources for their workstation. > > > To trully take advantage of the GPU the actual algorithms need to be > > rewritten to use features like SIMD and other advanced parallelization > > features, most desktop workloads don't lend themselves for that kind > > of parallelization. And it is also true. > Not true if what openacc hopes to achived indeed does become a reality. Hopes almost never becomes a reality. > Currently, you are most correct. Absolutely correct. ... > > When folks buy new hardware, it is often a good time to look at what > is on the horizon for computers they use. I also considered "what is on the horizon" when bought a brand new ATI Radeon R4770 graphic card about 6 years ago for computing purposes. In half a year it was discovered that it has much worse performance than ATI guys hoped for and, to improve it, they have to rewrite their proprietary drive for this graphic card. Instead of doing it, they just shamelessly dropped the support of the parallel computing feature of this graphic card in all subsequent versions of their drive. And as far as I know, no open source drive have ever supported the parallel computing feature of this graphic card as well. So, it was just a waste of money. Even more: I almost never worked at my assembled almost 7 year-old 4-core AMD computer with this graphic card as for all other purposes I prefer to work at my 10 year-old 2-core AMD computer with a very cheap on-board video card. Just to avoid extra heating and aircraft noise produced by R4770. So, Rich Freeman was absolutely right when he wrote in reply to your words above that > If all you need today is a $30 graphics card, then you probably should > just spend $30. If you think that software will be able to use all > kinds of fancy features on a $300 graphics card in two years, you > should just spend $30 today, and then wait two years and buy the fancy > graphics card on clearance for $10. > It is pretty rare that it is a wise move to spend money today on > computer hardware that you don't have immediate plans to use.
Re: [gentoo-user] CMYK comparison to sRGB between platforms
Mick wrote: > On the same hardware I noticed that a CMYK photograph converted to > sRGB looked mostly the same (indistinguishable) on Linux, but the > sRGB colours were brighter on MSWindows. > > I tried this by dual booting between MSWindows and Linux. > > Then I tried it by running MSWindows within a VM on a Linux host and > the MSWindows showed a clear difference in brightness between the two > formats. > > Finally, I checked on an AppleMac and the difference between the CMYK > and sRGB photographs was even more prominent than MSWindows. > > So, the Linux renedering seems to be misleading the user. Have you > noticed the same? > > BTW, both Linux machines that I tried this on are running radeon > drivers - are these to blame? The AppleMac is running Intel graphics > with its 'retina' monitor. Is it a matter of somehow tuning the Xorg > settings on my Linux PCs? First I must say that even though I'm working as a photographer I'm not an expert on Color Models. The professional exposure and print service that I use only accepts RGB Color Models. They use laser projectors to expose photographic papers. No conversion to CMYK is necessary. If I order fine art prints, they are doing the conversion by them self. All I have to do is softproofing my pictures in Lightroom using their different ICC profiles, to make sure that I don't deliver pictures that are out of the destination gamut. So I don't have any practical experiences with CMYK pictures. I only have some incomplete theoretical knowledge about it. CMYK is a subtractive color model and RGB is an additive color model, they are working completely different. It is not possible to convert one in to the other by just simply adjust some gamma curves or using a LUT as it is done by color management systems like lcms. When you are watching a CMYK picture, your picture viewer has to convert it to a RGB color space (sRGB or AdobeRGB or similar), because that is what your monitor needs. And I think there are not much picture viewers that are able to display a CMYK picture. This conversion can not be done by the graphics driver, regardless what kind of OS you use. Indeed Linux drivers can only use 8 bits per color channel (that's really poor IMHO) and Windows can use 10 bits per channel (depends on the graphics card), but this can't make big differences in brightness or saturation. It only leads to smother color transitions in some pictures. So I don't think that the drivers have anything to do with your problem. Apart from the different color models (CMYK vs RGB) there exist different color spaces (eg. AdobeRGB and sRGB). When you convert one color space in to an other, there are parameters like black point compensation and different rendering intents (perceptual and relative or absolute colorimetric), that can make a difference in the resulting picture. You didn't told exactly what you have done. This makes it difficult to find a reason for the problem. But I can think of different reasons for the phenomenon you observed: Different picture viewers and/or different color management systems and/or different color spaces (including different rendering intents respectively black point compensations). :-) -- Regards wabe
[gentoo-user] Re: new computer : any advice ?
Gevisz gmail.com> writes: > on-board video card. Just to avoid extra heating and aircraft noise > produced by R4770. Fanless video cards are wonderful. I have had many over the years but this one is still my (silent) favorite:: 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde PRO [Radeon HD 7750 / R7 250E] I did notice in a gentoo blog that openmp is a testing option for Clang-3.7 now? [1] Try not to loose faith, we all have had bad experiences, but clustering, distributed and systems aggregation codes are rapidly coalescing into something wonderful, so . keep the faith.. bro. ;-) wwr, James [1] http://blog.cafarelli.fr/2015/09/testing-clang-3-7-0-openmp-support/
[gentoo-user] Re: dec-terminal fonts
the...@sys-concept.com writes: > On 09/09/2015 03:04 PM, Harry Putnam wrote: >> I've got to liking this font: >> -dec-terminal-medium-r-normal--14-140-75-75-c-80-iso8859-1 >> >> But, after checking with xlsfonts... I don't see it available >> >> Can anyone tell me which font package would have -dec-termainal [...] >> fonts? > > > check: > media-fonts/font-bitstream-75dpi Thanks for the push. Did you mean see if I like them as well or did you mean the font I posted should be in that pkg? after install, checking with xlsfonts I still do not see -dec-terminal-medium-r-normal--14-140-75-75-c-80-iso8859-1 The -bitstream-terminal set in bold look smeared and huge the medium are good but again huge `18' is the only size I see. I do see that: -misc-fixed-bold-r-normal--15-120-100-100-c-90-iso8859-1 Is pretty good ... not quite up to the crispness of the `-dec-[...]' set though.
Re: [gentoo-user] Re: new computer : any advice ?
On Thu, 10 Sep 2015 21:12:37 + (UTC) james wrote: > Gevisz gmail.com> writes: > > > on-board video card. Just to avoid extra heating and aircraft noise > > produced by R4770. > > Fanless video cards are wonderful. I have had many over the years but this > one is still my (silent) favorite:: > > 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] > Cape Verde PRO [Radeon HD 7750 / R7 250E] Thank you for information. Never say never, but according to my current mood (which is unchanged for the last 5 years already :), I will never buy ATI video card again. And not because of noise and heating of ATI Radeon R4770 but because ATI shamelessly dropped support of their much advertised parallel computing feature for this video card. And I am not a fan of NVidia either. Only small, cheap and fanless on-board video cards to just manage the monitor! At least for the next 12 or 15 years. :) > I did notice in a gentoo blog that openmp is a testing option for Clang-3.7 > now? [1] > > Try not to loose faith, we all have had bad experiences, but clustering, > distributed and systems aggregation codes are rapidly coalescing into > something wonderful, so . keep the faith.. bro. > > ;-) > > wwr, > James > > > [1] http://blog.cafarelli.fr/2015/09/testing-clang-3-7-0-openmp-support/ > > > >