Please tell me how to plot correct pdf from embed image dwg.
I am evaluating Design Automation plot from the dwg with enbed image.
I recieved black filled dwg on below condition.
Dasign Automation API version:v2
AppPackage:PlotToPDF
DWG:rasterTest.dwg
AutoCAD version: 23.0(P.45.Z.36)
Also I tried my original plot apppackage,
and the result was the pdf filled black .
The default PlotToPDF activity is defined as follows:
_tilemode 0 -export _pdf _all result.pdf\n
This means it only plot paperspace. This drawing has no initialized paperspace layouts. You can do 2 things.
Use a different script that plots the current space.
AutoCAD PDF (General Documentation).pc3
e:\test.pdf
_N
_Y
Resave the drawing so that it has an initialized layout.
Related
I wrote a gimp python plugin to create an image, add a text layer, and write some text into it. Similar to this one.
I want to apply a different formatting to a portion of this text but I can't find the function to do it when I browse Filters > Script-Fu > Console > Browser.
This gif illustrates what I want. It was done manually:
Very complicated. You can get the info in the "parasite" attached to the text layer:
data=layer.parasite_find('gimp-text-layer').data
So for instance, for an image like this:
Data looks like this:
(markup "<markup>SO<span font=\"URW Bookman L Bold\">ME</span> <span size=\"15728\">TE</span>XT</markup>")
(font "Bungee")
(font-size 80)
(font-size-unit pixels)
(antialias yes)
(language "en")
(base-direction ltr)
(color (color-rgb 0 0 0))
(justify fill)
(box-mode dynamic)
(box-unit pixels)
(hinting yes)
Markup is possibly related to Cairo (which is the library used by Gimp to draw text and curves). However,
The parasite is only available once the image has been saved to disk
I have never checked what happens if you update the parasite.
Edited:
It seems creating or updating the parasite doesn't work and Gimp seems to ignored the parasite. It only considers it when loading the file, and when the file is saved, it generates a new parasite from the actual layer contents.
It may be easier for you to format several individual text layers side-by-side. To align them to the same baseline: if you use pdb.gimp_text_get_extents_fontname() with a character that has a flat bottom (I typically use "X") the "ascent" is the distance of the baseline from the top of the layer (round character such as "O" can extent slightly under the baseline).
I have sRGB images with color casts. To remove it manually I usually use Photoshop Level Adjustments. Photoshop also have tools for that: Auto Contrast or even better Auto Tone which also takes shadows, midtones & highlights into account.
If I remove the cast manually I adjust each of the RGB channels individually so that the darkest pixels are set to pure black and the lightest to pure white and then redistribute all other values (spreading the histogram). This is a simple approach but shows good results for my images.
In my node.js app I'm using sharp for image processing which uses libvips as its processing engine. I tried to remove the cast with .normalize() but this command works on all channels together and not individual for each of the RGB channels. So it doesn't work for me.
I also asked this question on the sharp project page. I tested the suggestion from lovell to try it with hist_local but the results are not useable for me.
Now I would like to find out how this could be done using the native libvips. I've played around with nip2 GUI and different commands but could not figure out how it could be achieved:
Histogram > Equalise Histogram > Global => Picture looks over saturated
Image > Levels > Scale to 0 - 255 => Channels ar not all spreading from 0 - 255 (I don't understand exactly what this command does?)
Thanks for every hint!
Addition
Here is a example with pictures from Photoshop to show what I want.
The source image is a picture of a frame from a film negative.
Image before processing
Step1 Invert image
Image after inversion
Step2 using Auto tone in Photoshop (works the same way as my description above about manually remove the color cast)
Image after Auto Tone
This last picture is ok for me.
nip2 has a menu item for this.
Load your image and mark a region on it containing the area you'd like to be neutral. It can be any lightness, it doesn't need to be white.
Use File / Open to get the file dialog and you should see the image loaded in your workspace as a thumbnail.
Doubleclick on the thumbnail to open an image view window.
In the view window, zoom and pan to the right spot. The user guide (press F1) has a section on image navigation.
Hold down CTRL and click and drag down and right to mark a rectangular region.
Back in the main window, click Toolkits / Tasks / Capture / White balance. You should see something like:
You can drag an resize your region to change the neutral point. Use the colour picker to set what white means. You can make other whites with (for example) Colour / New / Colour from CCT and link them together.
Click Colour / New / Colour from CCT to make a colour picker from CCT (correlated colour temperature) -- the temperature in Kelvin of that white.
Set it to something interesting, like 4800 for warm white.
Click on the formula for A5.white to edit it, and enter the cell of your CCT widget (A7 in this case).
Now you can drag the region to adjust the pixels to set the neutral from, and drag the CCT slider to set the temperature.
It can be annoying to find things in the toolkit menu. There's a thing for searching toolkits: in the main window, click View / Toolkit browser. You can enter something like "white" and it'll show related toolkit entries.
Here's another answer, but using pyvips and responding to the previous comments. I didn't want to delete the first answer as it still seemed useful.
This version finds the image histogram, searches for thresholds which will select 0.5% and 99.5% of pixels in each image band, then rescales the image so that those pixel values become 0 and 255.
import sys
import pyvips
# trim off this percentage of pixels from the top and bottom
trim_percent = 0.5
def percent(hist, percentage):
"""From a histogram, find the threshold above which lie
#percentage of pixels."""
# normalised cumulative histogram
norm = hist.hist_cum().hist_norm()
# column and row profile over percentage
c, r = (norm > norm.width * percentage / 100).profile()
return r.avg()
image = pyvips.Image.new_from_file(sys.argv[1])
# photographic negative
image = image.invert()
# find image histogram, split to set of separate bands
bands = image.hist_find().bandsplit()
# for each band, the low and high thresholds
low = [percent(band, trim_percent) for band in bands]
high = [percent(band, 100 - trim_percent) for band in bands]
# rescale image
scale = [255.0 / (h - l) for h, l in zip(high, low)]
image = (image - low) * scale
image.write_to_file(sys.argv[2])
It seems to give roughly similar results to the PS button. If I run:
$ ./autolevel.py ~/pics/before.jpg x.jpg
I see:
In the meantime I've found the Simplest Color Balance Algorithm which exactly describes the problem with color casts and there you can also find a C source code.
It is exactly the same solution as John describes in his second answer but as a small piece of c-code.
I'm now trying to use it as C/C++ addon with N-API under node.js.
fist off, if there is an exchange place more suitable for the question, please address me.
I'm designing some labels in gimp.
I created a A4 300dpi document and created the artwork, arranged them to use all the page. To measure the labels I create a rectangle with the "rectangle selection tool" and there one can inspect the size in cm:
I printed straight from gimp and to my surprise, the printed labels where smaller than designed. I assumed somehow someone along the line added margins to my already A4 document..
I tried saving to PDF and then printing the PDF, very similar results.
I'd say the difference is around 5%
What would be the appropriated method for printing exactly at the size I created the document ignoring any margins ??
I'm using Windows 10, HP ENVY 5010 and Gimp 2.10
When I use replot in the epslatex terminal, anything I replot is not showing up in the final output.
reset session
set terminal epslatex size 5.0in,4in color colortext font ',10' standalone
set output 'plots.tex'
set size square
plot sin(x)
replot cos(x)
set output
When I use , and plot in the same line, I get correct outputs.
reset session
set terminal epslatex size 5.0in,4in color colortext font ',10' standalone
set output 'plots.tex'
set size square
plot sin(x), cos(x)
set output
replot is very convenient becuase I can use set and change settings.
My question is how to use replot in gnuplot that prints in LaTeX.
In gnuplot both commands are different. Using plot sin(x) followed by replot cos(x) draws two plots: one with sin(x) and another one with the result of the previous plot command (ie sin(x)) and cos(x). Indeed
plot sin(x)
replot cos(x)
is absolutely equivalent to
plot sin(x)
plot sin(x), cos(x)
If you display the 'plots-inc.eps' or if you change the terminal to pdf, you have two pages, the first with the plot of sin(x) and the second with both.
The plots.tex file is supposed to be included in a some tex source and only contains one plot. The actual function that is plotted in the .tex file is the last one (with sin(x) and cos(x)). This code is adapted to dvi output and if you format it with latex plots.tex (and not pdflatex plots.tex) and view the .dvi file with xdvi (or whatever), you can verify that a plot with both functions is present. For unknown reasons, with pdflatex, only the sin(x) appears (but both are in the .tex code and there is the legend for cos(x)).
Here is what I get in the .dvi file:
We can do a zoom on this dvi file.
And compare it to the second plot if we use a pdf terminal.
As you can see, the plot rendering is worse with the dvi file and the function is smoother with the pdf output.
I think the problem is that the epslatex terminal is a very old driver. It was the default in the nineties, but with modern TeX engines, almost no one uses it anymore and I am not sure that it is actively maintained.
This probably explains the problems : the incomplete plot with pdflatex and the lower quality of the rendering. Most probably this driver has never really been adapted to engines like pdflatex or lualatex.
Unless you absolutely need dvi, I would suggest you to switch to another driver. Generate your plots as pdf and use \includegraphics to load them. The plot quality will be increased, but you will also gain all the flexibility of \includegraphics to resize, rotate, clip or do whatever you want to your plots.
Please note that the pdf driver will generate one plot per page and with your initial code there are two plots. You can include a specific page (ie plot) of the pdf with the 'page=' option of \includegraphics, but the simpler is to select different output files per plot.
set output 'plots.pdf'
plot sin(x)
set output 'plots2.pdf'
replot cos(x)
I have a pdf which I would like to use as a template to create a new pdf. The goal is to place an image inside a particular placeholder rectangle in the original pdf. The creation of the original pdf is under my control but the placeholder rectangle/bounds might be anywhere in the pdf. I am thinking of using a dummy image(of same dimensions) as the placeholder rectangle in the original pdf.
The Prawn gem supports placing an image at a given absolute/relative position within a page.
The trouble is that since the rectangle or dummy-image could be anywhere in the original pdf, I don't know what values to use for the following
pdf.image "/path/to/image", :at => [x,y] prawn call
Is there a way to get the coordinates of an image in the original pdf. My primitive understanding tells me that one would have to render the entire pdf to know this. Is that right ? If yes, what would be a good way to render pdf in memory (headless) and get the co-ordinates of various pdf objects(like bounding rectangles, images, etc).
I am not limited by language/runtime here as long as I can trigger it programmatically.
What could be other approaches to this problem ?
Not an answer (e.g. I don't know the Ruby language), but in lieu of any others, and because I can't post a comment yet, here's what I think.
If conditions stated above are true (placeholder and replacement images are exactly same size + same color model e.g. RGB 24 bps) and you control template creation (therefore you can store placeholder inside PDF uncompressed), it can be as quick and dirty as raw replacement in a file treated as byte string. E.g. placeholder filled with red, then you search for pattern (0xFF0000) x W*H and replace it with raw image data. Which, of course, you can get any way you like, e.g.:
convert my_image.jpg RGB:- | ...
If this solution is too dirty or conditions not exact, then parse page content stream for construct like
width 0 0 height x y cm
/name Do
It's not cleanest, either, but for vast number of simple page descriptions x and y are the coordinates you are looking for.
Further, if you control template creation, why don't you store additional information inside pdf as e.g. custom keys in Info dictionary, and then read them back when using the template.