• Global community
    • Language:
      • Deutsch
      • English
      • Español
      • Français
      • Português
  • 日本語コミュニティ
    Dedicated community for Japanese speakers
  • 한국 커뮤니티
    Dedicated community for Korean speakers
Exit
0

Images in PostScript

New Here ,
Jul 18, 2008 Jul 18, 2008

Copy link to clipboard

Copied

Hi!

I am kind of new in PostScrip programming (actually code generation from C) and I want to know if there are some kind of encoding of an image when you need to write what it contains in the .ps files.

Can I write the bytes it contains using hexadecimal numbers or is there some kind of encoding I have to do.

Thanks in advance!
TOPICS
Programming

Views

1.4K

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines
Explorer ,
Jul 18, 2008 Jul 18, 2008

Copy link to clipboard

Copied

PostScript is very flexible. You can use raw data (but many printers
will choke on this), simple hexadecimal, or a combination of filters
(such as LZW encoding then ASCII 85 conversion).

Aandi Inston

Votes

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines
New Here ,
Jul 18, 2008 Jul 18, 2008

Copy link to clipboard

Copied

I have read something about LZW and ASCII 85 conversion and it seems like a little work, that i don't want to do for nothing.
Do you think the combination of filters is much better than simple hexadecimal?

Votes

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines
Explorer ,
Jul 18, 2008 Jul 18, 2008

Copy link to clipboard

Copied

The only reason to use ASCII85 rather than ASCII, and the only reason
to use LZW rather than nothing, is because it makes a smaller file.
The smaller file might get to the printer more quickly. LZW is more
work for the printer, so it potentially prints more slowly when it
arrives.

Aandi Inston

Votes

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines
New Here ,
Jul 18, 2008 Jul 18, 2008

Copy link to clipboard

Copied

I understand.
Thanks for the tips!

Votes

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines
New Here ,
Jul 22, 2008 Jul 22, 2008

Copy link to clipboard

Copied

Hi

Tell me if i got this straight ...

If i have a jpeg image and i want to make it smaller i have to take the binary file that represent the picture and apply the LZW encoding, and after that an ASCII85 conversion.

Would tis work?
I ask this because i have already implemented this and I want to see I have any logical problem.

David

Votes

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines
Explorer ,
Jul 22, 2008 Jul 22, 2008

Copy link to clipboard

Copied

>If i have a jpeg image and i want to make it smaller i have to take the binary file that represent the picture and apply the LZW encoding, and after that an ASCII85 conversion.

Well, that would produce a valid image but it would be larger than the
JPEG in most cases.

For most JPEG files you can use them directly, treating them as having
DCT encoding, then apply ASCII85.

Aandi Inston

Votes

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines
New Here ,
Oct 28, 2008 Oct 28, 2008

Copy link to clipboard

Copied

LATEST
Hi Gigi n Aandi,

If you have a jpeg image and you want to make it smaller,then you can use "SCALING"
The scale operator allows you to change the size of the units,so that the image can be compressed.

Regards,
Navaneeth Sivappan

Votes

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines