LibreOffice Draw (29) Vector and Raster Graphics

LibreOffice Draw (29) Vector and Raster Graphics


I’m going to add a picture onto a slide and i’m doing that just by
dragging in dropping our picture onto the slide
i could also gone up into insert picture from file and there is our picture of the cake we will notice that this is a .jpeg that we placed onto our slide and when i click on it our picture toolbar in our color toolbar both appear. these
toolbars were covered in detail in the writer series – writer tuturoials sixty
six through seventy eight so we’re not going to repeat that but we may revisit a few things but
only to the point of how they apply to the new topics i’m going to place a rectangle on the slide when i place a shape like a rectangle next to the photo on
the slide it looks like they are different types
of graphics that’s because they are this rectangle is a vector graphic and libreoffice draw is a vector graphic
drawing tool – meaning when we please lines and shapes on the
screen legally office is able to calculate size
and position the vector graphic this allows us to have sharp crisp
graphics even if we zoom in very close because those lines are calculated and
recalculated to give us great line quality vector graphics take up less memory and give sharper lines the .jpeg on the other hand is known as a raster graphic the word raster is based on a latin
word in referred to the way in image was placed on a cathode ray tube screen you might recognize them as those old
green computer screens used up into the nineteen eighties raster graphics are also known as bitmap
graphics because they are made-up of a number of pixels at one time or another you’ve probably
zoomed in so much on a bitmap the dots got so big you couldn’t tell
what the original image was that doesn’t happen with vector graphics so if vector graphics can resize so much
sharper and take up so much less space why don’t we use them for family
pictures that’s because vector graphics work best
and geometric shapes like the shapes we use in LibreOffice Draw and at least with today’s technology
it’s just too much to turn a family picture into a number of geometric
shapes and have it look as good as a raster/bitmap graphic but for a organizational chart or
a flowchart vector graphics are the way to go a few videos back we create a figure by placing some
shapes on a slide, than resizing re coloring and grouping those shapes together this was the result of that group i’ve copied this figure a couple of times
onto a new slide given one a blue shirt find him bitmap and another one a maroon shirt and naming this one metafile at this point each of these is just a
copy of our grouped shapes figure so we have a little before and after i’m
going to copy these two figures (control+c) and bring them down and control+v paste a copy of our
figures now i’m going to select a our bitmap figure go up to modify convert and we see our only two options are
bitmap and metafile so let’s convert him to a bitmap and the other one modify convert to metafile so we’ve already said what a bitmap is but what is metafile? a metafile is kind of a cross between
a raster graphic and a vector graphic meaning it can do some of the things
a raster/bitmap graphic can do and he can do some of the things that
the vector graphic can do but it doesn’t have the complete functionality of either one and they’re different types of metafiles if i go to see this one by
right-clicking and go to save picture as we see that svm star view metafile is the default type if i click this downarrow we also see we can use in enhanced
metafile an OS2 to metafile or a .wmf which is a windows metafile i’m just going to cancel out here i
don’t want to save it looking at our metafile. now that we have
converted it, we noticed that this turns into he’s square were as before it was more of a rectangle and same with the bit map these two are both
the same so these are both going to be rectangles but when we come down the
bitmap gives us a big square and just gives us
space to the characters left or two our right that stretch other screen a little bit and zoom in a little we are at eight hundred and we see the car metafile still keeps some pretty sharp lines. when
we go over to our bitmap we can see that that is pixelated a
little bit in even at the text here is a little bit pixelated whereas when we come back to our
metafile it’s still pretty clear and crisp so, if we are adding text tune image we might want to convert it
to a metafile if we zoom in that text stays pretty clear let’s zoom back out a little bit this is our after conversion and in the bitmap here… actually all our
lines seem just a little bit blurry here where as in our metafile they seem a little
cleaner in cleared easier to read clicking on our metafile going up to our picture toolbar we noticed that are filter of effects is
unavailable we still have the option of changing
this to grayscale, black and white, or making this a watermark those all seem to work okay the color toolbar seems to work okay but the transparency does not seem to work clicking on the bitmap all of the filters work as well is changing it to the watermark, black-and-white, or gray scale the color toolbar appears to work as well as the transparency i’m going to select are bit map and
metafile characters copy them insert a new slide and paste them let me zoom out a little I’m going to move these guys up to the top and i want to insert a colored background let’s make this color gray now when i move my metafile over the grey background we need to move the gray background to
the back – Let me fix that arrangement, sent to back there we see air metafile and when we
move our bitmap he seems to have a white background
around him as long as we got a white background
that works great but if we move it on to some other color
they key gray background we seem to have a problem to change this i’m going to tools color replacer and i’m going to use my eye-dropper to select the color even though i know
it’s are you going to be white when i move my arrow down turns into a
hand notice when I put over the yellow, the blue…
right now I’m on the black… there’s blue so i pick the color that i want to
replace and i’m choosing white clicking that it’s telling us the white is selected
with a tollerance of ten meaning if i had it in blue and i wanted to have
a couple is shades of blue, I may want to increase that tolerance for now i’m going to leave it alone and i want to replace are white color
with transparent clicking replace now if i select this bitmap and move him
around we see he’s got a transparent background now this doesn’t only work for backgrounds, we can use it for a color Let’s select our eye-dropper again this time i’m going to select the maroon
color of our metafile and i want to change this color to red 4 when I click replace everywhere in that metafile that it finds that maroon is now changed
to red 4

Only registered users can comment.

  1. unfortunately I almost nothing understand on this tutorial , because is not drawning from basic step by step, and I not using Librewriter far. and i dont speak english and dont understand many words and its speak too fast on my ear .

  2. Good video, thanks man. (fantastic playlist, in fact). I still don't get the difference between a metafile and a vector graphic. They look similar to me. The difference between these and a raster is clear, though.

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