Hi Jeremy I suspect that your problem will be coming from the fact that screenshots are ~75-90 dpi, but that you are then printing them on a page at something like 300 dpi. Normally this means that the images are scaled up so that they have the right number of pixels on the page. This means adding new pixels, which are added by interpolation, meaning that your nice crisp screenshot images are ending up blurred.
The solution to this as far as I can tell is to resize the images up to something close to 300 dpi using some tool *outside* LyX. In GIMP this can be done using the Image->Scaling then selecting Interpolation->'None (Fastest)' after entering a new pixel size. I figure this will probably fix your problem -- please reply to the list if you still have problems. Possibly there is a better/automatic way to do this using Latex or LyX configuration options. Someone else may be able to advise on that. Normally, with photos and the like, this blurry kind of resizing is probably more likely to be what you want. Cheers JP Jeremy C. Reed wrote: > I have a black and white book with about 30 images. Many are screenshots > of X11 clients or X displays. I had Lulu print-on-demand print a copy so I > could see the images and many were blurry. > > I read at the Lulu website > (http://www.lulu.com/help/index.php?fSymbol=make_sure_pdf_prints_right) > the following: > > - Do not downsample your images unless they are fully rasterized. If they > are fully rasterized and the DPI is greater than 300, downsample to 300 > DPI. > > - Image compression should be set to ZIP if you want lossless (no > artifacts/distortion-free) images. To reduce filesize, use JPEG -> High. > > - If you are printing a color book that has black & white images in it, > the black & white images should have the colorspace set to grayscale. > > - Leave the images' colorspace in their original profiles. Do not convert > CMYK to RGB or vice versa. > > - Do not use CCITT or LZW compression. LZW compression creates multi-strip > images, which may show white lines when printed. > > - Use ZIP encoding for grayscale images. > > - The gamma of a grayscale image should be between 2.2 and 2.4. > > - DPI should be between 300 and 600 DPI. > > Any hints on doing any of this with pdflatex? > > Most of my screenshots need to be remade, so any suggestions on doing it > correctly? > > I think I saw some wiki pages about this, but a google search didn't help > me find them. > > Also I hve a few charts I need to redraw. Would it be best to generate in > a tool that can export in PDF? And then import that in my book? > (In a previous book, I used EPS files that I created and exported with > inkscape.) > > Jeremy C. Reed >
