Change DPI in embedded graphics afterwards?

[affinota]

Hi,

I have some self made embedded graphics in affinity publisher, so they are not saved as PNG or smth like that, just embedded I suppose from affinity designer. How can I change the DPI? Because if I change it, it takes no effect.

 

cheers

affinota

[MEB]

Hi @affinota,
With the Move Tool selected, click on the embedded image, then select the pixel dimensions in the top left of the context toolbar (before the Replace Image button) and adjust the DPI there. Assuming you are working with physical units, increasing the DPI will make the image dimensions smaller, while decreasing the DPI will make the image dimensions larger on canvas.

[affinota]

@MEB

thanks, I found that setting, but this don't change the real DPI of the embedded file. It just can increase it while making it smaller. If I make just 100% of the file, it shows me the 300DPI I choose at the beginning of the creation of this embedded file. But how can I change the original DPI to f. e. 1200DPI.

[MEB]

You can't do it within Affinity Publisher. That must be done externally, opening the image in a photo editor.

[affinota]

@MEB

as it seems, I deleted the original files, which are embedded within affinity publisher. But I can not "save as" the embedded graphic, it's grey out.

So is the only possibility just to copy the graphic in a new file in designer and then save it with new DPI?

 

Done so for now, but what I don't understand, I made a new file 3700x3700 with 1200DPI. If I insert it to the publisher and get it to the right size, I get 34% and 879DPI. The bigger the size the smaller the DPI and at 100% of the file I get again 300DPI. Where are my 1200DPI??

[HCl]

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[affinota]

@Return

that's a good point, thanks, but as I wrote above, I even made a new file with 1200DPI and get 300DPI at 100% of the file.

[thomaso]

6 hours ago, affinota said:

what I don't understand, I made a new file 3700x3700 with 1200DPI. If I insert it to the publisher and get it to the right size, I get 34% and 879DPI. The bigger the size the smaller the DPI and at 100% of the file I get again 300DPI. Where are my 1200DPI??

Did you just increase the resolution only (the relative DPI value) – or did you resample/upscale the image (the absolute number of pixels)? In APub, what matters for a placed image is not the DPI value stored with the image, but its number of pixels (megapixels), while the DPI of the APub layout document affects its placed dimensions.

Below are the steps to…

1. linking an embedded image,
2. increasing its megapixels
3. and increasing its size within the layout

… done in APub only, @MEB

[affinota]

3 hours ago, thomaso said:

Did you just increase the resolution only (the relative DPI value) – or did you resample/upscale the image (the absolute number of pixels)?

ok, first I just increased the DPI and saved the embedded graphic. As I understood that I don't have the original anymore, I copied the embedded graphic into a new file with 1200 DPI in designer and embedded it again. So it is a new file with 1200DPI and publisher shows at 100% just 300DPI. Why not the DPI, but the pixels do matter in publisher?

 

So if I want exact size within publisher and exact DPI, I must use cm instead of pixels, isn't it?

So I place a place holder, look for it's size and then make the exact graphic within designer.

I suppose, that would the the right way to do it.

[Alfred]

2 hours ago, affinota said:

So if I want exact size within publisher and exact DPI, I must use cm instead of pixels, isn't it?

If the document DPI is (for example) 300, then specifying the size as 600 px, 2 in, or 5.08 cm should all give you the same result.

[thomaso]

2 hours ago, affinota said:

So if I want exact size within publisher and exact DPI, I must use cm instead of pixels, isn't it?

I am not sure what you want to achieve, in particular with the desired 1200 DPI. – Is your goal to place an image in a certain size in your APub layout with an effective resolution of 1200 DPI while the layout document has 300 DPI only? If yes, will you export the layout with 1200 DPI or 300 DPI?

You mentioned 3700 px size. If this is the size the layout reports for the wanted image but in 300 DPI then you can upscale the image simply by multiplying its size by 4. (like I did by 3 in the video above). Or: switch the layout's unit in the ruler to Pixels -> draw a rectangle on the page appearing visually in the desired image size -> read the size of this rectangle in the Transform Panel -> upscale the image to 4x this size to achieve an image of 1200 DPI in a 300 DPI layout.

[affinota]

ok, as it seems, I don't understand the coherence between the DPI and the size.

If I want to have 1200DPI graphic within publisher, I must decide what size I want to have and then make the graphic with exact that size and 1200DPI. Then I'll have f. e. 25% of the graphic (size?), but the correct 1200DPI and the exact size I wanted within the publisher.

 

The next question is, how can I then export the publisher document with 300DPI text and images, but with 1200DPI graphics?

Does publisher exports the 1200DPI within the 300DPI document if I just don't break down DPI to 300 while exporting?

[thomaso]

22 minutes ago, affinota said:

ok, the document in publisher has 300DPI, so what happens if I put a designer graphic with 1200DPI into this document?

Do the publisher just breaks down the DPI to 300? This is just what it seems to do for me.

Yes, as mentioned, when placing an image, APub considers the current DPI of the layout document to calculate the visual dimensions in the layout.

You can do what I did in the video above:

1. Place the image in the layout, it will appear in a certain size and with 300 DPI.
2. Edit + Upscale the image to the required megapixels (*4).
3. Save and close the image document.
4. Adjust the visual size in the layout to get it displayed with 1200 DPI.

[HCl]

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[affinota]

ok, thank you, now I understand a little bit more about DPI and size

[thomaso]

51 minutes ago, Return said:

Deselect "downsample images" in the export settings. 

… or export with 1200 DPI. – What do you mean by "300DPI text and images", @affinota? Vector objects like text don't have a certain resolution and for text or vector graphics the export resolution does not matter. (unless the text or graphic is rasterized or gets rasterized on export)

If images, which are placed in the layout with 300 DPI, get exported into a document as 1200 DPI these images will not be upscaled unless they are 'vector cropped' (cropped by a vector shape or the Vector Crop Tool). If they are clipped via Picture Frames or placed without cropping they still get exported in a 1200 DPI export with a megapixel size that corresponds with 300 DPI, not 1200.

Whereas if you export the 300 DPI document without "downsample images" then every image will get exported with its original megapixels, this maybe 300 DPI, 1200 DPI or any other value, depending on the placed dimensions of the images vs. their megapixels.

This means, if the layout contains several images that are placed with more than 300 or 1200 DPI, the two options can result in exported files with quite different image sizes (exported megapixels) and thus of quite different export file sizes.

[MEB]

8 hours ago, thomaso said:

… done in APub only, @MEB

Thanks @thomaso. Totally forgot about the Edit Image button.

 

[affinota]

32 minutes ago, thomaso said:

Vector objects like text don't have a certain resolution and for text or vector graphics the export resolution does not matter

ah, forgot that text will be automaticaly vectorized

33 minutes ago, thomaso said:

This means, if the layout contains several images that are placed with more than 300 or 1200 DPI, the two options can result in exported files with quite different image sizes (exported megapixels) and thus of quite different export file sizes.

So I can just choose the DPI I want for each file within the document and export the document without downsampling, then I get, what I exactly have within the document.

[thomaso]

1 minute ago, affinota said:

So I can just choose the DPI I want for each file within the document and export the document without downsampling, then I get, what I exactly have within the document.

Yes, if you export with the deselected option "downsample images" every image will get exported with the effective DPI that corresponds with its placed dimensions & available (original) megapixels, while objects that require rasterization on export will get rasterized with the currently set document or export DPI.

The Resource Manager reports the effective DPI for each placed resource (embedded or linked). You can click the "Placed DPI" column label to sort the resource list by DPI and get a quick overview of the various DPI currently used in this layout document.

  - 

[affinota]

can not see any Resource Manager at Document menu

[HCl]

.

[affinota]

tricky

[HCl]

.

[thomaso]

45 minutes ago, affinota said:

can not see any Resource Manager at Document menu

30 minutes ago, affinota said:

tricky

Who/What guided you to "Document menu" for the Resource Manager? – Possibly you used the Help website but for V1?

[affinota]

20 minutes ago, thomaso said:

Possibly you used the Help website but for V1

surely, just found some website, suppose for the V1