Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Bastien writes: > Hi Eric, > > Eric S Fraga writes: > >> This leads me to suggest that both cases (dvipng >> and imagemagick) use the same latex code and, in fact, it may be >> possible to fold both functions org-create-formula-image-with-dvipng and >> org-create-formula-image-with-imagemagick into one... > > I would welcome such a refactoring, because there is obviously some > redundancy here. But I felt too lazy to tackle this so far, and I > guess I won't be tackling this before long. So the door is open for > anyone to enter! > > Best, Bastien, I will put this on my todo list and will try to find the requisite Emacs lisp expertise from within to accomplish this task! Thanks, eric -- : Eric S Fraga, GnuPG: 0xC89193D8FFFCF67D : in Emacs 24.3.50.1 and Org release_8.0.1-19-g9655a1
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Hi Eric, Eric S Fraga writes: > This leads me to suggest that both cases (dvipng > and imagemagick) use the same latex code and, in fact, it may be > possible to fold both functions org-create-formula-image-with-dvipng and > org-create-formula-image-with-imagemagick into one... I would welcome such a refactoring, because there is obviously some redundancy here. But I felt too lazy to tackle this so far, and I guess I won't be tackling this before long. So the door is open for anyone to enter! Best, -- Bastien
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Eric S Fraga writes: > Myles English writes: >> Please could you clarify a couple of things for me? >> >> From your investigations can you say if there is a bug in the orgmode >> use of dvipng, or has dvipng changed so that the expected behaviour is >> no longer supported? I too use a dark display (emacs theme >> zenburn-emacs), get the black fragments in normal latex blocks in org >> files (i.e. not beamer), and org-format-latex-options has no visible >> effect, how can I have white formulae again? > Thanks for prompting me on this. I've explored the code a bit > further. The two approaches, i.e. dvipng vs imagemagick, differ not > only in the tool used to create the image and the source of the image > (dvi versus pdf) but also in the latex code actually created to generate > the image in the first place. > > The dvipng route does not specify any colours in the latex and relies on > dvipng to change explicitly the background and foreground colours. The > imagemagick route, however, creates a latex file that has the colour > specifications directly and the conversion does change any colours. > > So, it could be that dvipng has changed and no longer changes the > colours correctly or it may be that latex has changed in how the dvi > file specifies colours? > > However, I have verified that dvipng will work just fine, without asking > for colour changes, if the dvi is created using the latex code used for > the imagemagick case. This leads me to suggest that both cases (dvipng > and imagemagick) use the same latex code and, in fact, it may be > possible to fold both functions org-create-formula-image-with-dvipng and > org-create-formula-image-with-imagemagick into one... but maybe this > has other repercussions. One such repercussion could be the use of > transparent colour specifications: dvipng would appear to support this > but imagemagick might not (as org appears to use white when transparent > is specified for a background colour, if I understood the code. Thanks for looking into it. Until a conclusion is reached with dvipng this gets things back to normal for me: (setq org-latex-create-formula-image-program 'imagemagick) Myles
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Myles English writes: > Hi Eric, > > Eric S Fraga writes: > >> Nick Dokos writes: >> >>> I tried the imagemagick setting, set the options variable to black >>> background >>> and red foreground - lo and behold, that's what I get in the preview. >> >> I was correct in my conclusion last night that I needed to go to >> bed... I was making a silly mistake (and I won't go into details ;-). >> >> This does indeed work! Thanks again. > > Please could you clarify a couple of things for me? > > From your investigations can you say if there is a bug in the orgmode > use of dvipng, or has dvipng changed so that the expected behaviour is > no longer supported? I too use a dark display (emacs theme > zenburn-emacs), get the black fragments in normal latex blocks in org > files (i.e. not beamer), and org-format-latex-options has no visible > effect, how can I have white formulae again? > > Thanks, > > Myles > Hi Myles, Thanks for prompting me on this. I've explored the code a bit further. The two approaches, i.e. dvipng vs imagemagick, differ not only in the tool used to create the image and the source of the image (dvi versus pdf) but also in the latex code actually created to generate the image in the first place. The dvipng route does not specify any colours in the latex and relies on dvipng to change explicitly the background and foreground colours. The imagemagick route, however, creates a latex file that has the colour specifications directly and the conversion does change any colours. So, it could be that dvipng has changed and no longer changes the colours correctly or it may be that latex has changed in how the dvi file specifies colours? However, I have verified that dvipng will work just fine, without asking for colour changes, if the dvi is created using the latex code used for the imagemagick case. This leads me to suggest that both cases (dvipng and imagemagick) use the same latex code and, in fact, it may be possible to fold both functions org-create-formula-image-with-dvipng and org-create-formula-image-with-imagemagick into one... but maybe this has other repercussions. One such repercussion could be the use of transparent colour specifications: dvipng would appear to support this but imagemagick might not (as org appears to use white when transparent is specified for a background colour, if I understood the code. eric -- : Eric S Fraga, GnuPG: 0xC89193D8FFFCF67D : in Emacs 24.3.50.1 and Org release_7.9.3d-891-gf52600
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Hi Eric, Eric S Fraga writes: > Nick Dokos writes: > >> I tried the imagemagick setting, set the options variable to black background >> and red foreground - lo and behold, that's what I get in the preview. > > I was correct in my conclusion last night that I needed to go to > bed... I was making a silly mistake (and I won't go into details ;-). > > This does indeed work! Thanks again. Please could you clarify a couple of things for me? >From your investigations can you say if there is a bug in the orgmode use of dvipng, or has dvipng changed so that the expected behaviour is no longer supported? I too use a dark display (emacs theme zenburn-emacs), get the black fragments in normal latex blocks in org files (i.e. not beamer), and org-format-latex-options has no visible effect, how can I have white formulae again? Thanks, Myles
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Nick Dokos writes: > I tried the imagemagick setting, set the options variable to black background > and red foreground - lo and behold, that's what I get in the preview. I was correct in my conclusion last night that I needed to go to bed... I was making a silly mistake (and I won't go into details ;-). This does indeed work! Thanks again. -- : Eric S Fraga, GnuPG: 0xC89193D8FFFCF67D : in Emacs 24.3.50.1 and Org release_7.9.3d-874-gf11acc
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Nick Dokos writes: > Eric S Fraga wrote: >> fragments is the most appealing mechanism. When I try to use >> org-preview-latex-fragment, the latex image is >> generated. Unfortunately, as I use a black background on my display, I >> cannot see the fragment as it is being generated with black text on a >> transparent background by default. Note, I am using dvipng for the >> image conversion. >> > > I tried the imagemagick setting, set the options variable to black background > and red foreground - lo and behold, that's what I get in the preview. Thanks for the suggestion. Should have tried that! However, it's not working for me; very strange. I have tried switching from dvipng to imagemagick but I get the same result (having cleaned out the ltxpng directory, restarted emacs, tried both #+OPTIONS: and direct variable setting, ...). Mind you, it's very late at night so I'm probably doing something stupid... I'm going to bed; I'll check again in the morning and will follow this up. Thanks again, eric -- : Eric S Fraga, GnuPG: 0xC89193D8FFFCF67D : in Emacs 24.3.50.1 and Org release_7.9.3d-874-gf11acc
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Nick Dokos writes: [...] > Use a light background emacs for the presentation. And don't tell > anybody that you switched. Street creds intact, you can switch back to > the cool dark background afterwards. If you get caught, you can argue > that you switched for projection purposes (assuming that you are going > to use a projector): studies show that dark letters on a light > background are easier to see from a distance (citation: J.WhlClthFab, > Vol. 3.14159, p. 2.7182818, Apr. 1, 1999) Love the citation... may try to pass this by some reviewer at some point. ;-) -- : Eric S Fraga, GnuPG: 0xC89193D8FFFCF67D : in Emacs 24.3.50.1 and Org release_7.9.3d-874-gf11acc
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Eric S Fraga wrote: > Hello, > > I am trying to use org-tree-slide for an interactive session I have to > facilitate soon. This works quite well, in a geeky kind of way ;-) > > However, I do want to display a couple of equations and using latex > fragments is the most appealing mechanism. When I try to use > org-preview-latex-fragment, the latex image is > generated. Unfortunately, as I use a black background on my display, I > cannot see the fragment as it is being generated with black text on a > transparent background by default. Note, I am using dvipng for the > image conversion. > I tried the imagemagick setting, set the options variable to black background and red foreground - lo and behold, that's what I get in the preview. Nick > I can customise org-format-latex-options to fix this, or so I > thought. No matter what I do, the resulting latex fragment has black > text. The problem appears to be that the -fg option to dvipng does not > work so it doesn't matter how I customise org-format-latex-options. > > Can anybody suggest a workaround (without changing the actual latex > itself)? I can customise the above variable to set the background for > latex images to white, which at least allows the equations to be seen, > but this is a mildly ugly solution. :( And ruins any geek street cred I > might have had ;-) > > Thanks, > eric > > -- > : Eric S Fraga, GnuPG: 0xC89193D8FFFCF67D > : in Emacs 24.3.50.1 and Org release_7.9.3d-874-gf11acc > >
Re: [O] [bug] latex fragment preview with dvipng ignores :foreground specification
Eric S Fraga wrote: > Hello, > > I am trying to use org-tree-slide for an interactive session I have to > facilitate soon. This works quite well, in a geeky kind of way ;-) > > However, I do want to display a couple of equations and using latex > fragments is the most appealing mechanism. When I try to use > org-preview-latex-fragment, the latex image is > generated. Unfortunately, as I use a black background on my display, I > cannot see the fragment as it is being generated with black text on a > transparent background by default. Note, I am using dvipng for the > image conversion. > > I can customise org-format-latex-options to fix this, or so I > thought. No matter what I do, the resulting latex fragment has black > text. The problem appears to be that the -fg option to dvipng does not > work so it doesn't matter how I customise org-format-latex-options. > I think that's true. Using dvipng from the command line, I can change the background but not the foreground. > Can anybody suggest a workaround (without changing the actual latex > itself)? I can customise the above variable to set the background for > latex images to white, which at least allows the equations to be seen, > but this is a mildly ugly solution. :( And ruins any geek street cred I > might have had ;-) > Use a light background emacs for the presentation. And don't tell anybody that you switched. Street creds intact, you can switch back to the cool dark background afterwards. If you get caught, you can argue that you switched for projection purposes (assuming that you are going to use a projector): studies show that dark letters on a light background are easier to see from a distance (citation: J.WhlClthFab, Vol. 3.14159, p. 2.7182818, Apr. 1, 1999) Nick
