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Bitmap import into schematic

Former Member

This is not at all urgent but maybe someone has an idea. Yesterday I had

a situation that happens a lot. I received a schematic that was in need

of some minor redesign. Only in PDF, like usual. So this time I wanted

to see if Eagle can do the redlines by importing a black&white bitmap

snapshot out of the PDF file. Then I wanted to draw the extra stuff in red.

 

Long story short in a graphics program the bitmap looked crisp and

clear. After importing it into an Eagle schematics window it was all

blurry like I had ten beers and with a bright yellow background. Useless

for any redline work, so I did it as usual with a red pen and my

scanner. Why is that rendering so badly in Eagle?

 

--

Regards, Joerg

 

http://www.analogconsultants.com/

 

Parents

  • Morten Leikvoll wrote:

    "Joerg" <invalid@invalid.invalid> wrote in message

    news:iqh0gu$m1e$1@cheetah.cadsoft.de...

    >> Morten Leikvoll wrote:

    >>> "Joerg" <invalid@invalid.invalid> wrote in message

    >>> news:iqegru$583$1@cheetah.cadsoft.de...

    >>>> That's actually what I had done initially to reduce the colors to 16.

    >>>> There were other reviewers before me so a little color left in there

    >>>> would have been nice. Eagle ate it but the results were not good.

    >>> Maybe you could post the final bitmap (raw) before importing, so we can

    >>> have

    >>> a look at that?

    >>>

    >> Can't post the schematic because that would violate confidentiality with

    >> my client. But the same happened when I tried to import a random graph

    >> from an NXP datasheet. The Cadsoft server limits attachments to 50k so I

    >> posted a snippet of that in my response to Tilman. Have attached it again.

    >>

    >> I can import that when selecting only one color (black) but it doesn't

    >> look very good and makes Eagle behave like molasses.

     

    First, this is not a bmp as I expected.

    Second, you never save a two color technical image as jpg. That screws it up

    totally.

     

     

    Hmm, MS-Paint stored this strictly as a black & white image, no colors,

    no grayscale.

     

     

    (You can check the quality of your two color image by trying to fill the

    background with a different color. If it leaves spots, its bad.)

    Third, it appears that the ulp does not handle details well. Write a new image

     

     

    That's my impression as well. Unfortunately I am not a programmer

    though, I'd have a hard time writing a ULP.

     

    As for the PNG you are right. It is also my preference. However, when

    you want to show results on the actual screen (IOW, a "print screen") it

    often results in file sizes much larger than JPEG in a comparable quality.

     

    --

    Regards, Joerg

     

    http://www.analogconsultants.com/

     

    "gmail" domain blocked because of excessive spam.

    Use another domain or send PM.

     

Reply

  • Morten Leikvoll wrote:

    "Joerg" <invalid@invalid.invalid> wrote in message

    news:iqh0gu$m1e$1@cheetah.cadsoft.de...

    >> Morten Leikvoll wrote:

    >>> "Joerg" <invalid@invalid.invalid> wrote in message

    >>> news:iqegru$583$1@cheetah.cadsoft.de...

    >>>> That's actually what I had done initially to reduce the colors to 16.

    >>>> There were other reviewers before me so a little color left in there

    >>>> would have been nice. Eagle ate it but the results were not good.

    >>> Maybe you could post the final bitmap (raw) before importing, so we can

    >>> have

    >>> a look at that?

    >>>

    >> Can't post the schematic because that would violate confidentiality with

    >> my client. But the same happened when I tried to import a random graph

    >> from an NXP datasheet. The Cadsoft server limits attachments to 50k so I

    >> posted a snippet of that in my response to Tilman. Have attached it again.

    >>

    >> I can import that when selecting only one color (black) but it doesn't

    >> look very good and makes Eagle behave like molasses.

     

    First, this is not a bmp as I expected.

    Second, you never save a two color technical image as jpg. That screws it up

    totally.

     

     

    Hmm, MS-Paint stored this strictly as a black & white image, no colors,

    no grayscale.

     

     

    (You can check the quality of your two color image by trying to fill the

    background with a different color. If it leaves spots, its bad.)

    Third, it appears that the ulp does not handle details well. Write a new image

     

     

    That's my impression as well. Unfortunately I am not a programmer

    though, I'd have a hard time writing a ULP.

     

    As for the PNG you are right. It is also my preference. However, when

    you want to show results on the actual screen (IOW, a "print screen") it

    often results in file sizes much larger than JPEG in a comparable quality.

     

    --

    Regards, Joerg

     

    http://www.analogconsultants.com/

     

    "gmail" domain blocked because of excessive spam.

    Use another domain or send PM.

     

Children
  • in reply to Former Member

    Morten Leikvoll wrote:

    "Joerg" <invalid@invalid.invalid> wrote in message

    news:iqh0gu$m1e$1@cheetah.cadsoft.de...

    >> Morten Leikvoll wrote:

    >>> "Joerg" <invalid@invalid.invalid> wrote in message

    >>> news:iqegru$583$1@cheetah.cadsoft.de...

    >>>> That's actually what I had done initially to reduce the colors to 16.

    >>>> There were other reviewers before me so a little color left in there

    >>>> would have been nice. Eagle ate it but the results were not good.

    >>> Maybe you could post the final bitmap (raw) before importing, so we can

    >>> have

    >>> a look at that?

    >>>

    >> Can't post the schematic because that would violate confidentiality with

    >> my client. But the same happened when I tried to import a random graph

    >> from an NXP datasheet. The Cadsoft server limits attachments to 50k so I

    >> posted a snippet of that in my response to Tilman. Have attached it again.

    >>

    >> I can import that when selecting only one color (black) but it doesn't

    >> look very good and makes Eagle behave like molasses.

     

    First, this is not a bmp as I expected.

    Second, you never save a two color technical image as jpg. That screws it up

    totally.

     

     

    Hmm, MS-Paint stored this strictly as a black & white image, no colors,

    no grayscale.

     

     

    (You can check the quality of your two color image by trying to fill the

    background with a different color. If it leaves spots, its bad.)

    Third, it appears that the ulp does not handle details well. Write a new image

     

     

    That's my impression as well. Unfortunately I am not a programmer

    though, I'd have a hard time writing a ULP.

     

    As for the PNG you are right. It is also my preference. However, when

    you want to show results on the actual screen (IOW, a "print screen") it

    often results in file sizes much larger than JPEG in a comparable quality.

     

    --

    Regards, Joerg

     

    http://www.analogconsultants.com/

     

    "gmail" domain blocked because of excessive spam.

    Use another domain or send PM.