Bitmap import into schematic

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?

i know similar problems in other programs if they fail to render the

alpha channel in a Bitmap picture.

Perhaps you have better effort, with a different fileformat,

or after adding a white background layer and flatten the layers

to the visible.

Gimp can do that.

hth, good luck,

--

Jonas Stein <news@jonasstein.de>

Jonas Stein wrote:

>> 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?

 

i know similar problems in other programs if they fail to render the

alpha channel in a Bitmap picture.

 

Perhaps you have better effort, with a different fileformat,

or after adding a white background layer and flatten the layers

to the visible.

 

Gimp can do that.

 

AFAIK Eagle will only take a bitmap. The background was white but after

importing into Eagle it turned bright yellow. That would be ok (sort of)

but the resolution was greatly reduced and so bad that I had to do this

sketch job by hand again.

Maybe I should buy a green ink pen as well in case another reviewer has

used red already

--

Regards, Joerg

http://www.analogconsultants.com/

On 5/9/2011 4:00 PM, Joerg wrote:

Jonas Stein wrote:

>>> 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?

>>

>> i know similar problems in other programs if they fail to render the

>> alpha channel in a Bitmap picture.

>>

>> Perhaps you have better effort, with a different fileformat,

>> or after adding a white background layer and flatten the layers

>> to the visible.

>>

>> Gimp can do that.

>>

>

AFAIK Eagle will only take a bitmap. The background was white but after

importing into Eagle it turned bright yellow. That would be ok (sort of)

but the resolution was greatly reduced and so bad that I had to do this

sketch job by hand again.

 

Maybe I should buy a green ink pen as well in case another reviewer has

used red already

 

I think the problem is that EAGLE can not handle the bitmap image

directly, i believe when it is imported it will be converted to polygons

and vectors. but the yellow background is very interesting...no

explanation for that!

Gary Gofstein wrote:

On 5/9/2011 4:00 PM, Joerg wrote:

>> Jonas Stein wrote:

>>>> 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?

>>>

>>> i know similar problems in other programs if they fail to render the

>>> alpha channel in a Bitmap picture.

>>>

>>> Perhaps you have better effort, with a different fileformat,

>>> or after adding a white background layer and flatten the layers

>>> to the visible.

>>>

>>> Gimp can do that.

>>>

>>

>> AFAIK Eagle will only take a bitmap. The background was white but after

>> importing into Eagle it turned bright yellow. That would be ok (sort of)

>> but the resolution was greatly reduced and so bad that I had to do this

>> sketch job by hand again.

>>

>> Maybe I should buy a green ink pen as well in case another reviewer has

>> used red already

>>

I think the problem is that EAGLE can not handle the bitmap image

directly, i believe when it is imported it will be converted to polygons

and vectors. but the yellow background is very interesting...no

explanation for that!

Once the bitmap was in Eagle it didn't look like vector but an

assortment of coarse fuzzy blocks. Similar to what you see on the screen

of a digital TV set shortly before the signal pixelates out, plus the

fuzz overlay.

The yellow was full pigmentation, like a school bus

--

Regards, Joerg

http://www.analogconsultants.com/

Joerg schrieb:

AFAIK Eagle will only take a bitmap. The background was white but after

importing into Eagle it turned bright yellow. That would be ok (sort of)

but the resolution was greatly reduced and so bad that I had to do this

sketch job by hand again.

I don't understand your problem. Of course, EAGLE can take only "binary"

pixels, no color shades, and the color it displays is the color assigned

to the particular layer. There also is no background color.

So it's pretty obvious you need a true b/w image and convert that by one

of the available programs. The result are rectangles in the given layer,

representing single pixels resp. pixel lines of your image. The

pixel/rectangle size is provided to the converter as a parameter. It's a

simple 1:1 conversion, and in EAGLE the result looks /exactly/ identical

to the bitmap source.

BTDT.

Tilmann

Tilmann Reh wrote:

Joerg schrieb:

 

>> AFAIK Eagle will only take a bitmap. The background was white but after

>> importing into Eagle it turned bright yellow. That would be ok (sort of)

>> but the resolution was greatly reduced and so bad that I had to do this

>> sketch job by hand again.

 

I don't understand your problem. Of course, EAGLE can take only "binary"

pixels, no color shades, and the color it displays is the color assigned

to the particular layer. There also is no background color.

 

Hmm, the import-bmp.ulp just asked me to reduce the number of colors to

32 or something like that, so I did.

So it's pretty obvious you need a true b/w image and convert that by on

of the available programs. The result are rectangles in the given layer,

representing single pixels resp. pixel lines of your image. The

pixel/rectangle size is provided to the converter as a parameter. It's a

simple 1:1 conversion, and in EAGLE the result looks /exactly/ identical

to the bitmap source.

 

Ok, so now I took a graph from the BC857 datasheet (source: NXP) and

reduced the grayscale to pure black and white. Looks less nice after

that and won't work for all cases but ok, man's gotta do what man's

gotta do. The result is attached. This time it turned green

I had cut cut out little pieces and reduce the JPEG because the Cadsoft

server limits post sizes. But the green and the white stripes still

show, also the poor quality of the graph. Result is in the next post

(hopefully ...)

BTDT.

 

Wish I knew how. The other thing that happens is that rendering in Eagle

becomes very slow after import.

--

Regards, Joerg

http://www.analogconsultants.com/

Result file

Result file