Imagens em formato EPS com transparência (ajuda)

[LuIvDa]

Olá a todos

Eu fiz algumas ilustrações em que o fundo é transaprente, mas ao guardar em modo EPS e ao abri-la de novo, vejo que a mesma ilustração deixa de ter o fundo transparente.

Isso é normal, ou eu estarei a fazer alguma coisa errada no momento de guardar a imagem no photoshoop?? Alguém me pode ajudar, como o poderei fazer de forma a que o fundo fique sempre transparente, seja no photoshoop ou no gimp??

[Nancy OShea]

EPS does not support transparency.  Transparency is only supported in native AI or PSD files and also PNG or GIF files exported for web.

[Test Screen Name]

You should only save actual vector work in EPS for Adobe stock. It is not used when saving work from Photoshop. There is no way to deliver a raster (photo/image) with transparent background so far as I know; it's not a product category that Adobe sell. 

[PepeCastro]

Hello, if it is possible to save the EPS mode with transparent backgrounds. This is very old from when alpha channels did not exist, but if it is possible, for this you must make a path with the pen tool to the image that you are going to use and save the path as "clipping path" when you save you must save eps from Photoshop activating the ASCII85 encoding and you already have it to be able to use it in any editing program

[Test Screen Name]

Yes, but surely it would be wrong to save an EPS from Photoshop In all cases...

[Abambo]

EPS for raster images is completely obsolete. You should not save any raster to EPS these days. EPS for vector images is obsolete. It should be avoided by now.

[PepeCastro]

why not ? In fact, the large presses that have to print large quantities use it since the RIPs work with Postscript and understand better the layout of an EPS than an alpha channel 32 when they have to interpret a halftone screen live on the plate. question was if you could, and yes, you can.

[Abambo · Accepted solution]

You should not use EPS because PDF is much more performant and has superseded EPS for prepress work. PDF X/4 allows for real transparency, and you can embed RGB images, instead of CMYK and letting the RIP doing the hard work. In addition, you should embed fonts instead of outlining. See this thread from 2011 on the Acrobat forum: https://acrobatusers.com/forum/printing-prepress/rip-eps-or-pdf-files/

And well, we are here on the stock contributor forum, and there the answer is: no raster image for EPS or AI assets.

[Nancy OShea]

To clarify, .EPS is a holdover zombie file type that's rarely used much by designers anymore.  Unlike .AI or .SVG which are fully editable, .EPS files are not because the image contains both bitmap info which does NOT support transparency and vector data.  Only the vector information is editable using the correct vector software (Illustrator or Inkscape). 

When purchasing vector graphics for use in commercial projects, I prefer .AI or .SVG files because they are more flexible to work with. 

[PepeCastro]

Give me a technical reason why it should not be used

--
Pepe Castro
Malaga, España

[Nancy OShea]

EPS hasn't been updated this century.  It's trapped in the past.  It can't support modern ICC color profiles or alpha-transparency.

You may say that an EPS saved from Illustrator with the optional  "Preserve Illustrator editing capabilities" permits transparency when opened in Illustrator again.  But that's because of the way Illustrator saves EPS files.  Illustrator adds an AI proprietary portion which doubles the EPS file size.  It doesn't work with other software.

[PepeCastro]

How strange, those from adobe must not be aware of this because they keep asking for vectors in EPS and those from ShutterStock who also ask you for eps AI 8 must be completely crazy. Well it's not my problem, put the format that you like the most
The question was about the possibility of using transparency with an EPS and the answer is YES.
When a Rip Harlequin for plates for a 7-unit press crashes because it doesn't interpret Alpha 32, I'll remind you not to solve it that way.

[Nancy OShea]

Old habits die hard.

[Abambo]

EPS Ai 8 is what is probably best supported also by 3rd party programs. But that is like having a current F1 car and putting a 1956 F1 motor in. Yes, the 1956 car did win races at his time and still may bring you forward, but at the end, you'll lose the race.

[Abambo]

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@PepeCastro wrote:

How strange, those from adobe must not be aware of this because they keep asking for vectors in EPS

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Perferred format is Ai with embedded PDF. The embedded PDF will allow for use in other applications, but without the editing capabilities of the native Ai format.

Tis does't mean that you can't edit the PDF (or EPS) part, but you will lose all Ai specific information.

[Abambo]

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@PepeCastro wrote:

The question was about the possibility of using transparency with an EPS and the answer is YES.

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The question was EPS transparency in conjunction with Photoshop (or Gimp). As PostScript is a programming language, you can probably do anything, like programming the pong game. I would, however, not suppose that you can play that on your printer.

Now, Photoshop and others seam to assume that an EPS file is a non layered graphic that gets rendered on a white background. So the resulting file is not transparent.

When you use a RIP anything that is "white" means basically no ink, so per se, the background shines through. To get it not shining through, you need to knock it out in the RIP. The RIP does not need to know something about transparency, it just draws pixels a a certain position according to the PostScript instructions. That looks to me like the easiest of his tasks.