to contribute to the Jetex.org website
We welcome your
contributions articles, plans, advertisements, instruction sheets, photographs
of models in fact any documentary material that relates micro rocket-powered
You can send us
copies of your material either electronically or by postal
need to create a digital copy of your material. You can do this
either with a scanner or a digital camera. If you don't have access
to either of these gadgets, please see the section below headed
"Sending by postal mail". If you
do have a scanner or camera, then read on
Go for image
quality at the expense of file size
Create your images using high quality
settings on your scanner or camera. Although this will produce
large digital files, this outcome is not important. We'll compress
the files for web delivery, achieving the optimum balance between
image quality and file size. What is important is that we have a
high quality of image to start with.
use a camera or a scanner?
possible, use a scanner to copy printed originals. That way,
you will ensure the most faithful reproduction (see below
for hints on getting the best image from the scanner). A camera
is, of course, best for creating images of three-dimensional objects,
such as models. Set it to a high quality setting remember
quality is more important than file size at this stage.
format is best?
digital camera will produce a JPEG file just send
us that and don't bother with trying to convert it to a different
your scanner allows you to create a bitmap image (usually
a TIFF or BMP format), choose that output format. (See below for
advice on the colour depth setting.) The resulting
file will be large, but its great advantage over other formats is
that it will contain a single data element for each picture element
(pixel) and thus ensure maximum fidelity to the original.
formats, such as JPEG or GIF, compress the data by using codes that
represent a number of pixels in a single data element. These are
the formats that are used for web browser display, but they don't result in optimum images
to work from, because of the lack of maximum
fidelity to the original. However, if your scanner outputs only in JPEG format, that's fine.
A high quality JPEG image can be almost as good to work from as a bitmap image.
entirely different type of format is the vector-based image, such
as a PDF (or Acrobat) file. Instead of storing pixel data, this
type of file stores a series of instructions that are 'played back'
by the display software to reconstruct the image. The detail in
such images varies according the level chosen at creation. If you
have a plan in this format, by all means send it and we'll convert
it to an image suitable for web browser display.
can I get you the best image from my scanner?
Preferably, set your scanner resolution to 300 dpi (dots per inch). For our purposes, this resolution gives the best balance between fidelity
to the original and size of file.
you can also set the colour depth, what you choose depends on whether
you're copying a black and white document or one in colour. If it's
black and white, choose 8 bit (= 256 shades) grayscale. If the original is coloured,
choose the maximum setting. Hopefully, your scanner will at least
be capable of 24 bit colour (so-called True Colour, allowing a range
of 16,777,216 possible colours). As with resolution, the greater
the colour depth, the greater the fidelity to the original and the
greater the file size.
Some scanners also
offer a choice of quality level. The 'High Quality' scan provides a higher
quality by multiple sampling, where the scanner effectively scans twice (or
more) and then averages the results. If your scanner allows this, choose the
highest quality setting.
settings should be all you need to worry about. Don't bother with
attempting any optimisation it's better to leave that to
us as part of the conversion to a web image. Your quality file will
provide maximum density and detail and allow us the maximum flexibility
in down-sampling to create an optimum web image, using our professional-quality
web graphic software (Macromedia Fireworks).
How can I
send you the image file?
Attaching the file
to an email message is fine. Because of the file size, it will take time to
transmit, but we don't mind waiting an extra few minutes for material that's
already been waiting for decades to get to us. Send it to the website owner and manager,
you may want to post the file to a website that you have access to (that way,
other members will be able to see it immediately). In that case, just email
to let us know it's there.
Sending by postal
Post your photocopy
Dr Roger Simmonds
8 Orchard Way
Cambs PE 19 5RE
If you have any
questions or you'd like further information, please contact us at:
Thanks for your