High resolution jpgs

[goldberg988]

I am looking at some Andre Caplet manuscripts on BnF/Gallica. I can download jpgs using the multi scan downloader, they are about 7MB per page. I can convert to PDF using GIMP (probably not the best method) and then it's 10+MB per page. The jpgs are greyscale/monochrome and high-resolution. What is the best procedure here? Just live with huge files, since it's a manuscript? Convert to monochrome (I feel a lot of detail gets lost since they are manuscripts)? A better way to convert greyscale to PDF without losing too much detail, and reducing file size? Thanks

[coulonnus]

Please provide a specific Caplet's work and I will see what I can do.

[goldberg988]

Here's one. Happy if you can help; but also would still like to know how to do the process myself? Thanks

https://gallica.bnf.fr/ark:/12148/btv1b100718419/#

[coulonnus]

Look at https://imslp.org/wiki/Paroles_%C3%A0_l ... ndr%C3%A9) when it becomes available. I'll provides technical details if you like it.

[goldberg988]

Yes, I would love the technical details! Thanks

[coulonnus]

Well, several posts will be necessary ! Be ready to manipulate the command promp language which I may no longer call the DOS. From https://gallica.bnf.fr/ark:/12148/btv1b100718419/ click "En savoir plus".
Store the line "Identifiant : ark:/12148/btv1b100718419" somewhere

If there are less than 5 images edit a batch file called curlgallica.bat with
curl https://gallica.bnf.fr//iiif/ark:/12148/bpt6k10291515/f[1-5]/full/full/0/native.jpg -o q#1.jpg
replacing the big bpt string with that of the present gallica page.

Type curlgallica.bat into the command prompt window. This will create the 5 first images of this score.

But if there are more than 5 images the gallica server is exasperated by your requests and screws up images above No. 5

A workaround is to set a 10-s delay time between the images. Create this batch file :

set lienbnf=<your bpt number>
@FOR /L %%A IN (1,1,%1) DO (curl https://gallica.bnf.fr//iiif/ark:/12148/%lienbnf%/f[%%A-%%A]/full/full/0/native.jpg -o "p#1.jpg"
timeout 10)

replacing %1 with the number of images.

This creates a set of .jpg images, each one about 3 MB size.

I'll continue when you succeed at this stage.